ENH PHP 8.1 compatibility

src/Search/Criteria/SearchCriteria.php

@@ -222,7 +222,7 @@ class SearchCriteria implements SearchCriteriaInterface
     protected function getConjunction($key)
     {
         $conjunctions = $this->getConjunctions();
-        if (!array_key_exists($key, $conjunctions)) {
+        if (!array_key_exists($key, $conjunctions ?? [])) {
             return null;
         }
 

src/Search/FullTextSearch.php

@@ -67,7 +67,7 @@ class FullTextSearch
                 }
 
                 if ($hidden) {
-                    $candidates = array_diff($candidates, $hidden);
+                    $candidates = array_diff($candidates ?? [], $hidden);
                 }
 
                 // Create all indexes
@@ -86,7 +86,7 @@ class FullTextSearch
 
                 $valid = array();
                 foreach ($all as $indexclass => $instance) {
-                    if (is_subclass_of($indexclass, $class)) {
+                    if (is_subclass_of($indexclass, $class ?? '')) {
                         $valid[$indexclass] = $instance;
                     }
                 }

src/Search/Indexes/SearchIndex.php

@@ -70,7 +70,7 @@ abstract class SearchIndex extends ViewableData
      */
     protected function getSourceName($source)
     {
-        $source = explode(self::config()->get('class_delimiter'), $source);
+        $source = explode(self::config()->get('class_delimiter') ?? '', $source ?? '');
 
         return $source[0];
     }
@@ -102,7 +102,7 @@ abstract class SearchIndex extends ViewableData
      */
     public function fieldData($field, $forceType = null, $extraOptions = [])
     {
-        $fullfield = str_replace(".", "_", $field);
+        $fullfield = str_replace(".", "_", $field ?? '');
         $sources = $this->getClasses();
 
         foreach ($sources as $source => $options) {
@@ -112,8 +112,8 @@ abstract class SearchIndex extends ViewableData
 
         $found = [];
 
-        if (strpos($field, '.') !== false) {
+        if (strpos($field ?? '', '.') !== false) {
-            $lookups = explode(".", $field);
+            $lookups = explode(".", $field ?? '');
             $field = array_pop($lookups);
 
             foreach ($lookups as $lookup) {
@@ -133,7 +133,7 @@ abstract class SearchIndex extends ViewableData
                             // we only want to include base class for relation, omit classes that inherited the relation
                             $relationList = Config::inst()->get($dataclass, 'has_one', Config::UNINHERITED);
                             $relationList = (!is_null($relationList)) ? $relationList : [];
-                            if (!array_key_exists($lookup, $relationList)) {
+                            if (!array_key_exists($lookup, $relationList ?? [])) {
                                 continue;
                             }
 
@@ -146,7 +146,7 @@ abstract class SearchIndex extends ViewableData
                             // we only want to include base class for relation, omit classes that inherited the relation
                             $relationList = Config::inst()->get($dataclass, 'has_many', Config::UNINHERITED);
                             $relationList = (!is_null($relationList)) ? $relationList : [];
-                            if (!array_key_exists($lookup, $relationList)) {
+                            if (!array_key_exists($lookup, $relationList ?? [])) {
                                 continue;
                             }
 
@@ -160,7 +160,7 @@ abstract class SearchIndex extends ViewableData
                             // we only want to include base class for relation, omit classes that inherited the relation
                             $relationList = Config::inst()->get($dataclass, 'many_many', Config::UNINHERITED);
                             $relationList = (!is_null($relationList)) ? $relationList : [];
-                            if (!array_key_exists($lookup, $relationList)) {
+                            if (!array_key_exists($lookup, $relationList ?? [])) {
                                 continue;
                             }
 
@@ -199,7 +199,7 @@ abstract class SearchIndex extends ViewableData
             $class = $this->getSourceName($class);
             $dataclasses = SearchIntrospection::hierarchy($class, $options['include_children']);
 
-            while (count($dataclasses)) {
+            while (count($dataclasses ?? [])) {
                 $dataclass = array_shift($dataclasses);
                 $type = null;
                 $fieldoptions = $options;
@@ -228,9 +228,9 @@ abstract class SearchIndex extends ViewableData
 
                 if ($type) {
                     // Don't search through child classes of a class we matched on. TODO: Should we?
-                    $dataclasses = array_diff($dataclasses, array_values(ClassInfo::subclassesFor($dataclass)));
+                    $dataclasses = array_diff($dataclasses ?? [], array_values(ClassInfo::subclassesFor($dataclass) ?? []));
                     // Trim arguments off the type string
-                    if (preg_match('/^(\w+)\(/', $type, $match)) {
+                    if (preg_match('/^(\w+)\(/', $type ?? '', $match)) {
                         $type = $match[1];
                     }
                     // Get the origin
@@ -412,7 +412,7 @@ abstract class SearchIndex extends ViewableData
 
     public function buildDependancyList()
     {
-        $this->dependancyList = array_keys($this->getClasses());
+        $this->dependancyList = array_keys($this->getClasses() ?? []);
 
         foreach ($this->getFieldsIterator() as $name => $field) {
             if (!isset($field['class'])) {
@@ -434,7 +434,7 @@ abstract class SearchIndex extends ViewableData
             $this->derivedFields = array();
 
             foreach ($this->getFieldsIterator() as $name => $field) {
-                if (count($field['lookup_chain']) < 2) {
+                if (count($field['lookup_chain'] ?? []) < 2) {
                     continue;
                 }
 
@@ -445,7 +445,7 @@ abstract class SearchIndex extends ViewableData
                     $this->derivedFields[$key]['fields'][$fieldname] = $fieldname;
                     SearchIntrospection::add_unique_by_ancestor($this->derivedFields['classes'], $field['class']);
                 } else {
-                    $chain = array_reverse($field['lookup_chain']);
+                    $chain = array_reverse($field['lookup_chain'] ?? []);
                     array_shift($chain);
 
                     $this->derivedFields[$key] = array(
@@ -473,7 +473,7 @@ abstract class SearchIndex extends ViewableData
     {
         ksort($state);
         $parts = array('id' => $id, 'base' => $base, 'state' => json_encode($state));
-        return implode('-', array_values($parts));
+        return implode('-', array_values($parts ?? []));
     }
 
     /**
@@ -586,7 +586,7 @@ abstract class SearchIndex extends ViewableData
 
         // First, if this object is directly contained in the index, add it
         foreach ($this->classes as $searchclass => $options) {
-            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass))) {
+            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass ?? ''))) {
                 $base = DataObject::getSchema()->baseDataClass($searchclass);
                 $dirty[$base] = array();
                 foreach ($statefulids as $statefulid) {
@@ -605,7 +605,7 @@ abstract class SearchIndex extends ViewableData
             if (!SearchIntrospection::is_subclass_of($class, $derivation['classes'])) {
                 continue;
             }
-            if (!array_intersect_key($fields, $derivation['fields'])) {
+            if (!array_intersect_key($fields ?? [], $derivation['fields'])) {
                 continue;
             }
 

src/Search/Processors/SearchUpdateBatchedProcessor.php

@@ -89,7 +89,7 @@ abstract class SearchUpdateBatchedProcessor extends SearchUpdateProcessor
         }
 
         // Don't re-process completed queue
-        if ($this->currentBatch >= count($this->batches)) {
+        if ($this->currentBatch >= count($this->batches ?? [])) {
             return true;
         }
 
@@ -138,14 +138,14 @@ abstract class SearchUpdateBatchedProcessor extends SearchUpdateProcessor
                 while ($ids) {
                     // Estimate maximum number of items to take for this iteration, allowing for the soft cap
                     $take = $batchSize - $currentSize;
-                    if (count($ids) <= $take + $softCap) {
+                    if (count($ids ?? []) <= $take + $softCap) {
                         $take += $softCap;
                     }
-                    $items = array_slice($ids, 0, $take, true);
+                    $items = array_slice($ids ?? [], 0, $take, true);
-                    $ids = array_slice($ids, count($items), null, true);
+                    $ids = array_slice($ids ?? [], count($items ?? []), null, true);
 
                     // Update batch
-                    $currentSize += count($items);
+                    $currentSize += count($items ?? []);
                     $merge = array(
                         $base => array(
                             $stateKey => array(

src/Search/Processors/SearchUpdateCommitJobProcessor.php

@@ -97,7 +97,7 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
 
         if ($dirty) {
             $indexes = FullTextSearch::get_indexes();
-            static::$dirty_indexes = array_keys($indexes);
+            static::$dirty_indexes = array_keys($indexes ?? []);
         }
         return $id;
     }
@@ -126,7 +126,7 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
     {
         if (empty($this->indexes)) {
             $indexes = FullTextSearch::get_indexes();
-            $this->indexes = array_keys($indexes);
+            $this->indexes = array_keys($indexes ?? []);
         }
         return $this->indexes;
     }
@@ -135,7 +135,7 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
     {
         // If we've indexed exactly as many as we would like, we are done
         return $this->skipped
-            || (count($this->getAllIndexes()) <= count($this->completed));
+            || (count($this->getAllIndexes() ?? []) <= count($this->completed ?? []));
     }
 
     public function prepareForRestart()
@@ -213,7 +213,7 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
     {
         // Skip index if this is already complete
         $name = get_class($index);
-        if (in_array($name, $this->completed)) {
+        if (in_array($name, $this->completed ?? [])) {
             $this->addMessage("Skipping already comitted index {$name}");
             return;
         }
@@ -240,8 +240,8 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
     public function getJobData()
     {
         $data = new stdClass();
-        $data->totalSteps = count($this->getAllIndexes());
+        $data->totalSteps = count($this->getAllIndexes() ?? []);
-        $data->currentStep = count($this->completed);
+        $data->currentStep = count($this->completed ?? []);
         $data->isComplete = $this->jobFinished();
         $data->messages = $this->messages;
 
@@ -265,7 +265,7 @@ class SearchUpdateCommitJobProcessor implements QueuedJob
 
     public function addMessage($message, $severity = 'INFO')
     {
-        $severity = strtoupper($severity);
+        $severity = strtoupper($severity ?? '');
         $this->messages[] = '[' . date('Y-m-d H:i:s') . "][$severity] $message";
     }
 

src/Search/Processors/SearchUpdateProcessor.php

@@ -55,7 +55,7 @@ abstract class SearchUpdateProcessor
                 $forclass[$statekey] = array('state' => $state, 'ids' => array($id => array($index)));
             } elseif (!isset($forclass[$statekey]['ids'][$id])) {
                 $forclass[$statekey]['ids'][$id] = array($index);
-            } elseif (array_search($index, $forclass[$statekey]['ids'][$id]) === false) {
+            } elseif (array_search($index, $forclass[$statekey]['ids'][$id] ?? []) === false) {
                 $forclass[$statekey]['ids'][$id][] = $index;
                 // dirty count stays the same
             }
@@ -89,7 +89,7 @@ abstract class SearchUpdateProcessor
                 SearchVariant::activate_state($state);
 
                 // Ensure that indexes for all new / updated objects are included
-                $objs = DataObject::get($base)->byIDs(array_keys($ids));
+                $objs = DataObject::get($base)->byIDs(array_keys($ids ?? []));
 
                 /** @var DataObject $obj */
                 foreach ($objs as $obj) {

src/Search/Processors/SearchUpdateQueuedJobProcessor.php

@@ -45,7 +45,7 @@ class SearchUpdateQueuedJobProcessor extends SearchUpdateBatchedProcessor implem
 
     public function jobFinished()
     {
-        return $this->currentBatch >= count($this->batches);
+        return $this->currentBatch >= count($this->batches ?? []);
     }
 
     public function setup()
@@ -68,7 +68,7 @@ class SearchUpdateQueuedJobProcessor extends SearchUpdateBatchedProcessor implem
     public function getJobData()
     {
         $data = new stdClass();
-        $data->totalSteps = count($this->batches);
+        $data->totalSteps = count($this->batches ?? []);
         $data->currentStep = $this->currentBatch;
         $data->isComplete = $this->jobFinished();
         $data->messages = $this->messages;
@@ -91,7 +91,7 @@ class SearchUpdateQueuedJobProcessor extends SearchUpdateBatchedProcessor implem
 
     public function addMessage($message, $severity = 'INFO')
     {
-        $severity = strtoupper($severity);
+        $severity = strtoupper($severity ?? '');
         $this->messages[] = '[' . date('Y-m-d H:i:s') . "][$severity] $message";
     }
 

src/Search/SearchIntrospection.php

@@ -21,7 +21,7 @@ class SearchIntrospection
     public static function is_subclass_of($class, $of)
     {
         $ancestry = isset(self::$ancestry[$class]) ? self::$ancestry[$class] : (self::$ancestry[$class] = ClassInfo::ancestry($class));
-        return is_array($of) ? (bool)array_intersect($of, $ancestry) : array_key_exists($of, $ancestry);
+        return is_array($of) ? (bool)array_intersect($of, $ancestry) : array_key_exists($of, $ancestry ?? []);
     }
 
     protected static $hierarchy = array();
@@ -40,12 +40,12 @@ class SearchIntrospection
         $key = "$class!" . ($includeSubclasses ? 'sc' : 'an') . '!' . ($dataOnly ? 'do' : 'al');
 
         if (!isset(self::$hierarchy[$key])) {
-            $classes = array_values(ClassInfo::ancestry($class));
+            $classes = array_values(ClassInfo::ancestry($class) ?? []);
             if ($includeSubclasses) {
-                $classes = array_unique(array_merge($classes, array_values(ClassInfo::subclassesFor($class))));
+                $classes = array_unique(array_merge($classes, array_values(ClassInfo::subclassesFor($class) ?? [])));
             }
 
-            $idx = array_search(DataObject::class, $classes);
+            $idx = array_search(DataObject::class, $classes ?? []);
             if ($idx !== false) {
                 array_splice($classes, 0, $idx+1);
             }
@@ -76,7 +76,7 @@ class SearchIntrospection
 
         // Strip out any subclasses of $class already in the list
         $children = ClassInfo::subclassesFor($class);
-        $list = array_diff($list, $children);
+        $list = array_diff($list ?? [], $children);
 
         // Then add the class in
         $list[] = $class;

src/Search/Services/SearchableService.php

@@ -199,11 +199,11 @@ class SearchableService
         if (empty($skipClasses)) {
             return false;
         }
-        if (in_array($class, $skipClasses)) {
+        if (in_array($class, $skipClasses ?? [])) {
             return true;
         }
         foreach ($skipClasses as $skipClass) {
-            if (in_array($skipClass, class_parents($class))) {
+            if (in_array($skipClass, class_parents($class) ?? [])) {
                 return true;
             }
         }

src/Search/Updaters/SearchUpdater.php

@@ -106,7 +106,7 @@ class SearchUpdater
                     'command' => $command,
                     'fields' => array()
                 );
-            } elseif (is_subclass_of($class, $writes[$key]['class'])) {
+            } elseif (is_subclass_of($class, $writes[$key]['class'] ?? '')) {
                 // Otherwise update the class label if it's more specific than the currently recorded one
                 $writes[$key]['class'] = $class;
             }
@@ -118,7 +118,7 @@ class SearchUpdater
         }
 
         // Trim non-delete records without fields
-        foreach (array_keys($writes) as $key) {
+        foreach (array_keys($writes ?? []) as $key) {
             if ($writes[$key]['command'] !== 'delete' && empty($writes[$key]['fields'])) {
                 unset($writes[$key]);
             }

src/Search/Variants/SearchVariant.php

@@ -202,7 +202,7 @@ abstract class SearchVariant
             // Merge the variants applicable to the current class into the list of common variants, using
             // the variant instance to replace any previous versions for the same class name (should be singleton
             // anyway).
-            $commonVariants = array_replace($commonVariants, $variantsForClass);
+            $commonVariants = array_replace($commonVariants ?? [], $variantsForClass);
         }
 
         // Cache for future calls
@@ -322,7 +322,7 @@ abstract class SearchVariant
         $merged = array_values(array_unique(array_merge($left, $right)));
 
         // If there is only one item, return it as a single string
-        if (count($merged) === 1) {
+        if (count($merged ?? []) === 1) {
             return reset($merged);
         }
         return $merged;

src/Search/Variants/SearchVariantVersioned.php

@@ -65,7 +65,7 @@ class SearchVariantVersioned extends SearchVariant
             $class = $details['class'];
             $stage = Versioned::DRAFT;
 
-            if (preg_match('/^(.*)_' . Versioned::LIVE . '$/', $table, $matches)) {
+            if (preg_match('/^(.*)_' . Versioned::LIVE . '$/', $table ?? '', $matches)) {
                 $class = DataObject::getSchema()->tableClass($matches[1]);
                 $stage = Versioned::LIVE;
             }

src/Search/Variants/SearchVariant_Caller.php

@@ -19,7 +19,7 @@ class SearchVariant_Caller
         $values = array();
 
         foreach ($this->variants as $variant) {
-            if (method_exists($variant, $method)) {
+            if (method_exists($variant, $method ?? '')) {
                 $value = $variant->$method(...$args);
                 if ($value !== null) {
                     $values[] = $value;

src/Solr/Reindex/Handlers/SolrReindexBase.php

@@ -81,9 +81,9 @@ abstract class SolrReindexBase implements SolrReindexHandler
 
         // Apply filter
         if (!is_array($filterClasses)) {
-            $filterClasses = explode(',', $filterClasses);
+            $filterClasses = explode(',', $filterClasses ?? '');
         }
-        return array_intersect_key($classes, array_combine($filterClasses, $filterClasses));
+        return array_intersect_key($classes ?? [], array_combine($filterClasses ?? [], $filterClasses ?? []));
     }
 
     /**

src/Solr/Reindex/Handlers/SolrReindexImmediateHandler.php

@@ -109,7 +109,7 @@ class SolrReindexImmediateHandler extends SolrReindexBase
 
         $res = $process->getOutput();
         if ($logger) {
-            $logger->info(preg_replace('/\r\n|\n/', '$0  ', $res));
+            $logger->info(preg_replace('/\r\n|\n/', '$0  ', $res ?? ''));
         }
 
         // If we're in dev mode, commit more often for fun and profit

src/Solr/Services/SolrService.php

@@ -24,7 +24,7 @@ class SolrService extends SolrService_Core
      */
     protected function coreCommand($command, $core, $params = array())
     {
-        $command = strtoupper($command);
+        $command = strtoupper($command ?? '');
         $params = array_merge($params, array('action' => $command, 'wt' => 'json'));
         $params[$command === 'CREATE' ? 'name' : 'core'] = $core;
 

src/Solr/Solr.php

@@ -94,7 +94,7 @@ class Solr
         $module = ModuleLoader::getModule('silverstripe/fulltextsearch');
         $modulePath = $module->getPath();
 
-        if (version_compare($version, '4', '>=')) {
+        if (version_compare($version ?? '', '4', '>=')) {
             $versionDefaults = [
                 'service'       => Solr4Service::class,
                 'extraspath'    => $modulePath . '/conf/solr/4/extras/',

src/Solr/SolrIndex.php

@@ -89,7 +89,7 @@ abstract class SolrIndex extends SearchIndex
     {
         $globalOptions = Solr::solr_options();
         $path = $this->templatesPath ? $this->templatesPath : $globalOptions['templatespath'];
-        return rtrim($path, '/');
+        return rtrim($path ?? '', '/');
     }
 
     /**
@@ -127,7 +127,7 @@ abstract class SolrIndex extends SearchIndex
             $indexParts[] = $indexSuffix;
         }
 
-        return implode($indexParts);
+        return implode($indexParts ?? '');
     }
 
     public function getTypes()
@@ -256,11 +256,11 @@ abstract class SolrIndex extends SearchIndex
      */
     protected function getNiceSuggestion($collation = '')
     {
-        $collationParts = explode(' ', $collation);
+        $collationParts = explode(' ', $collation ?? '');
 
         // Remove advanced query params from the beginning of each collation part.
         foreach ($collationParts as $key => &$part) {
-            $part = ltrim($part, '+');
+            $part = ltrim($part ?? '', '+');
         }
 
         return implode(' ', $collationParts);
@@ -275,7 +275,7 @@ abstract class SolrIndex extends SearchIndex
      */
     protected function getSuggestionQueryString($collation = '')
     {
-        return str_replace(' ', '+', $this->getNiceSuggestion($collation));
+        return str_replace(' ', '+', $this->getNiceSuggestion($collation) ?? '');
     }
 
     /**
@@ -312,7 +312,7 @@ abstract class SolrIndex extends SearchIndex
     {
         // Ensure that 'boost' is recorded here without being captured by solr
         $boost = null;
-        if (array_key_exists('boost', $extraOptions)) {
+        if (array_key_exists('boost', $extraOptions ?? [])) {
             $boost = $extraOptions['boost'];
             unset($extraOptions['boost']);
         }
@@ -515,7 +515,7 @@ abstract class SolrIndex extends SearchIndex
         }
 
         // Check single origin
-        return $class === $base || is_subclass_of($class, $base);
+        return $class === $base || is_subclass_of($class, $base ?? '');
     }
 
     protected function _addField($doc, $object, $field)
@@ -536,7 +536,7 @@ abstract class SolrIndex extends SearchIndex
                     if (!$sub) {
                         continue;
                     }
-                    $sub = gmdate('Y-m-d\TH:i:s\Z', strtotime($sub));
+                    $sub = gmdate('Y-m-d\TH:i:s\Z', strtotime($sub ?? ''));
                 }
 
                 /* Solr requires numbers to be valid if presented, not just empty */
@@ -552,7 +552,7 @@ abstract class SolrIndex extends SearchIndex
                 if (!$value) {
                     return;
                 }
-                $value = gmdate('Y-m-d\TH:i:s\Z', strtotime($value));
+                $value = gmdate('Y-m-d\TH:i:s\Z', strtotime($value ?? ''));
             }
 
             /* Solr requires numbers to be valid if presented, not just empty */
@@ -586,7 +586,7 @@ abstract class SolrIndex extends SearchIndex
         // Add the user-specified fields
 
         foreach ($this->getFieldsIterator() as $name => $field) {
-            if ($field['base'] === $base || (is_array($field['base']) && in_array($base, $field['base']))) {
+            if ($field['base'] === $base || (is_array($field['base']) && in_array($base, $field['base'] ?? []))) {
                 $this->_addField($doc, $object, $field);
             }
         }
@@ -607,7 +607,7 @@ abstract class SolrIndex extends SearchIndex
         $docs = array();
 
         foreach ($this->getClasses() as $searchclass => $options) {
-            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass))) {
+            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass ?? ''))) {
                 $base = DataObject::getSchema()->baseDataClass($searchclass);
                 $docs[] = $this->_addAs($object, $base, $options);
             }
@@ -619,7 +619,7 @@ abstract class SolrIndex extends SearchIndex
     public function canAdd($class)
     {
         foreach ($this->classes as $searchclass => $options) {
-            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass))) {
+            if ($searchclass == $class || ($options['include_children'] && is_subclass_of($class, $searchclass ?? ''))) {
                 return true;
             }
         }
@@ -713,7 +713,7 @@ abstract class SolrIndex extends SearchIndex
 
         // If using boosting, set the clean term separately for highlighting.
         // See https://issues.apache.org/jira/browse/SOLR-2632
-        if (array_key_exists('hl', $params) && !array_key_exists('hl.q', $params)) {
+        if (array_key_exists('hl', $params ?? []) && !array_key_exists('hl.q', $params ?? [])) {
             $params['hl.q'] = implode(' ', $hlq);
         }
 
@@ -870,7 +870,7 @@ abstract class SolrIndex extends SearchIndex
      */
     protected function applySearchVariants(SearchQuery $query)
     {
-        $classes = count($query->classes) ? $query->classes : $this->getClasses();
+        $classes = count($query->classes ?? []) ? $query->classes : $this->getClasses();
 
         /** @var SearchVariant_Caller $variantCaller */
         $variantCaller = SearchVariant::withCommon($classes);
@@ -886,7 +886,7 @@ abstract class SolrIndex extends SearchIndex
      */
     public function sanitiseClassName($className, $replaceWith = '\\\\')
     {
-        return str_replace('\\', $replaceWith, $className);
+        return str_replace('\\', $replaceWith ?? '', $className ?? '');
     }
 
     /**
@@ -901,14 +901,14 @@ abstract class SolrIndex extends SearchIndex
         $q = array();
         foreach ($searchQuery->search as $search) {
             $text = $search['text'];
-            preg_match_all('/"[^"]*"|\S+/', $text, $parts);
+            preg_match_all('/"[^"]*"|\S+/', $text ?? '', $parts);
 
             $fuzzy = $search['fuzzy'] ? '~' : '';
 
             foreach ($parts[0] as $part) {
                 $fields = (isset($search['fields'])) ? $search['fields'] : array();
                 if (isset($search['boost'])) {
-                    $fields = array_merge($fields, array_keys($search['boost']));
+                    $fields = array_merge($fields, array_keys($search['boost'] ?? []));
                 }
                 if ($fields) {
                     $searchq = array();
@@ -1014,7 +1014,7 @@ abstract class SolrIndex extends SearchIndex
      */
     protected function getCriteriaComponent(SearchQuery $searchQuery)
     {
-        if (count($searchQuery->getCriteria()) === 0) {
+        if (count($searchQuery->getCriteria() ?? []) === 0) {
             return null;
         }
 
@@ -1095,7 +1095,7 @@ abstract class SolrIndex extends SearchIndex
 
         // Upload additional files
         foreach (glob($this->getExtrasPath() . '/*') as $file) {
-            if (is_file($file)) {
+            if (is_file($file ?? '')) {
                 $store->uploadFile($this->getIndexName(), $file);
             }
         }

src/Solr/Stores/SolrConfigStore_File.php

@@ -20,8 +20,8 @@ class SolrConfigStore_File implements SolrConfigStore
     {
         $targetDir = "{$this->local}/{$index}/conf";
 
-        if (!is_dir($targetDir)) {
+        if (!is_dir($targetDir ?? '')) {
-            $worked = @mkdir($targetDir, 0770, true);
+            $worked = @mkdir($targetDir ?? '', 0770, true);
 
             if (!$worked) {
                 throw new \RuntimeException(
@@ -36,7 +36,7 @@ class SolrConfigStore_File implements SolrConfigStore
     public function uploadFile($index, $file)
     {
         $targetDir = $this->getTargetDir($index);
-        copy($file, $targetDir . '/' . basename($file));
+        copy($file ?? '', $targetDir . '/' . basename($file ?? ''));
     }
 
     public function uploadString($index, $filename, $string)

src/Solr/Stores/SolrConfigStore_Post.php

@@ -43,7 +43,7 @@ class SolrConfigStore_Post implements SolrConfigStore
      */
     public function uploadFile($index, $file)
     {
-        $this->uploadString($index, basename($file), file_get_contents($file));
+        $this->uploadString($index, basename($file ?? ''), file_get_contents($file ?? ''));
     }
 
     /**

src/Solr/Stores/SolrConfigStore_WebDAV.php

@@ -46,7 +46,7 @@ class SolrConfigStore_WebDAV implements SolrConfigStore
     public function uploadFile($index, $file)
     {
         $targetDir = $this->getTargetDir($index);
-        WebDAV::upload_from_file($file, $targetDir . '/' . basename($file));
+        WebDAV::upload_from_file($file, $targetDir . '/' . basename($file ?? ''));
     }
 
     public function uploadString($index, $filename, $string)

src/Solr/Tasks/Solr_Reindex.php

@@ -86,7 +86,7 @@ class Solr_Reindex extends Solr_BuildTask
                     continue;
                 }
                 //check the indexname matches the index passed to the request
-                if (!strcasecmp(singleton($solrIndexClass)->getIndexName(), $index)) {
+                if (!strcasecmp(singleton($solrIndexClass)->getIndexName() ?? '', $index ?? '')) {
                     //if we match, set the correct index name and move on
                     $index = $solrIndexClass;
                     break;
@@ -104,7 +104,7 @@ class Solr_Reindex extends Solr_BuildTask
             // Run grouped batches (id % groups = group)
             $group = $request->getVar('group');
             $indexInstance = singleton($index);
-            $state = json_decode($request->getVar('variantstate'), true);
+            $state = json_decode($request->getVar('variantstate') ?? '', true);
 
             $handler->runGroup($this->getLogger(), $indexInstance, $state, $class, $groups, $group);
             return;

src/Solr/Writers/SolrSearchQueryWriterBasic.php

@@ -20,7 +20,7 @@ class SolrSearchQueryWriterBasic extends AbstractSearchQueryWriter
         return sprintf(
             '%s(%s%s%s)',
             $this->getComparisonPolarity($searchCriterion->getComparison()),
-            addslashes($searchCriterion->getTarget()),
+            addslashes($searchCriterion->getTarget() ?? ''),
             $this->getComparisonConjunction(),
             $searchCriterion->getQuoteValue($searchCriterion->getValue())
         );

src/Solr/Writers/SolrSearchQueryWriterIn.php

@@ -62,7 +62,7 @@ class SolrSearchQueryWriterIn extends AbstractSearchQueryWriter
 
             $conditions[] = sprintf(
                 '%s%s%s',
-                addslashes($searchCriterion->getTarget()),
+                addslashes($searchCriterion->getTarget() ?? ''),
                 $this->getComparisonConjunction(),
                 $value
             );

src/Solr/Writers/SolrSearchQueryWriterRange.php

@@ -21,7 +21,7 @@ class SolrSearchQueryWriterRange extends AbstractSearchQueryWriter
         return sprintf(
             '%s(%s:%s%s%s%s%s)',
             $this->getComparisonPolarity($searchCriterion->getComparison()),
-            addslashes($searchCriterion->getTarget()),
+            addslashes($searchCriterion->getTarget() ?? ''),
             $this->getOpenComparisonContainer($searchCriterion->getComparison()),
             $this->getLeftComparison($searchCriterion),
             $this->getComparisonConjunction(),

src/Utils/CombinationsArrayIterator.php

@@ -18,20 +18,21 @@ class CombinationsArrayIterator implements Iterator
         $this->arrays = array();
         $this->keys = array();
 
-        $keys = array_keys($args);
+        $keys = array_keys($args ?? []);
-        $values = array_values($args);
+        $values = array_values($args ?? []);
 
         foreach ($values as $i => $arg) {
-            if (is_array($arg) && count($arg)) {
+            if (is_array($arg) && count($arg ?? [])) {
                 $this->arrays[] = $arg;
                 $this->keys[] = $keys[$i];
             }
         }
 
-        $this->numArrays = count($this->arrays);
+        $this->numArrays = count($this->arrays ?? []);
         $this->rewind();
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         if (!$this->numArrays) {
@@ -46,11 +47,13 @@ class CombinationsArrayIterator implements Iterator
         }
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return $this->isValid;
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->k++;
@@ -68,15 +71,17 @@ class CombinationsArrayIterator implements Iterator
         }
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         $res = array();
         for ($i = 0; $i < $this->numArrays; $i++) {
-            $res[$this->keys[$i]] = current($this->arrays[$i]);
+            $res[$this->keys[$i]] = current($this->arrays[$i] ?? []);
         }
         return $res;
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->k;

src/Utils/Logging/MonologFactory.php

@@ -90,7 +90,7 @@ class MonologFactory implements SearchLogFactory
     {
         return Injector::inst()->createWithArgs(
             Logger::class,
-            array(strtolower($name))
+            array(strtolower($name ?? ''))
         );
     }
 

src/Utils/MultipleArrayIterator.php

@@ -14,7 +14,7 @@ class MultipleArrayIterator implements Iterator
 
         $this->arrays = array();
         foreach ($args as $arg) {
-            if (is_array($arg) && count($arg)) {
+            if (is_array($arg) && count($arg ?? [])) {
                 $this->arrays[] = $arg;
             }
         }
@@ -22,6 +22,7 @@ class MultipleArrayIterator implements Iterator
         $this->rewind();
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->active = $this->arrays;
@@ -30,16 +31,19 @@ class MultipleArrayIterator implements Iterator
         }
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->active ? current($this->active[0]) : false;
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->active ? key($this->active[0]) : false;
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         if (!$this->active) {
@@ -54,8 +58,9 @@ class MultipleArrayIterator implements Iterator
         }
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
-        return $this->active && (current($this->active[0]) !== false);
+        return $this->active && (current($this->active[0] ?? []) !== false);
     }
 }

src/Utils/WebDAV.php

@@ -17,7 +17,7 @@ class WebDAV
     public static function exists($url)
     {
         // WebDAV expects that checking a directory exists has a trailing slash
-        if (substr($url, -1) != '/') {
+        if (substr($url ?? '', -1) != '/') {
             $url .= '/';
         }
 
@@ -42,7 +42,7 @@ class WebDAV
 
     public static function mkdir($url)
     {
-        $ch = self::curl_init(rtrim($url, '/') . '/', 'MKCOL');
+        $ch = self::curl_init(rtrim($url ?? '', '/') . '/', 'MKCOL');
 
         curl_exec($ch);
         $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
@@ -72,13 +72,13 @@ class WebDAV
     public static function upload_from_string($string, $url)
     {
         $fh = tmpfile();
-        fwrite($fh, $string);
+        fwrite($fh, $string ?? '');
         fseek($fh, 0);
         return self::put($fh, $url);
     }
 
     public static function upload_from_file($string, $url)
     {
-        return self::put(fopen($string, 'rb'), $url);
+        return self::put(fopen($string ?? '', 'rb'), $url);
     }
 }

tests/BatchedProcessorTest.php

@@ -133,28 +133,28 @@ class BatchedProcessorTest extends SapphireTest
         $this->assertEquals(9, $data->totalSteps);
         $this->assertEquals(0, $data->currentStep);
         $this->assertEmpty($data->isComplete);
-        $this->assertEquals(0, count($index->getAdded()));
+        $this->assertEquals(0, count($index->getAdded() ?? []));
 
         // Advance state
         for ($pass = 1; $pass <= 8; $pass++) {
             $processor->process();
             $data = $processor->getJobData();
             $this->assertEquals($pass, $data->currentStep);
-            $this->assertEquals($pass * 5, count($index->getAdded()));
+            $this->assertEquals($pass * 5, count($index->getAdded() ?? []));
         }
 
         // Last run should have two hanging items
         $processor->process();
         $data = $processor->getJobData();
         $this->assertEquals(9, $data->currentStep);
-        $this->assertEquals(42, count($index->getAdded()));
+        $this->assertEquals(42, count($index->getAdded() ?? []));
         $this->assertTrue($data->isComplete);
 
         // Check any additional queued jobs
         $processor->afterComplete();
         $service = singleton(QueuedJobService::class);
         $jobs = $service->getJobs();
-        $this->assertEquals(1, count($jobs));
+        $this->assertEquals(1, count($jobs ?? []));
         $this->assertInstanceOf(SearchUpdateCommitJobProcessor::class, $jobs[0]['job']);
     }
 
@@ -242,7 +242,7 @@ class BatchedProcessorTest extends SapphireTest
         }
         $data = $processor->getJobData();
         $this->assertEquals(8, $data->currentStep);
-        $this->assertEquals(42, count($index->getAdded()));
+        $this->assertEquals(42, count($index->getAdded() ?? []));
         $this->assertTrue($data->isComplete);
     }
 }

tests/SolrIndexSubsitesTest.php

@@ -223,7 +223,7 @@ class SolrIndexSubsitesTest extends SapphireTest
         $subsiteIDs = ['0'] + $this->allFixtureIDs(Subsite::class);
         $subsiteIDs = array_map(function ($v) {
             return (string) $v;
-        }, $subsiteIDs);
+        }, $subsiteIDs ?? []);
         $mockWrites = [
             '35910:File:a:0:{}' => [
                 'base' => File::class,
@@ -253,7 +253,7 @@ class SolrIndexSubsitesTest extends SapphireTest
         $tmpMockWrites = $mockWrites;
         $variant->extractManipulationWriteState($tmpMockWrites);
         foreach ($tmpMockWrites as $mockWrite) {
-            $this->assertCount(count($subsiteIDs), $mockWrite['statefulids']);
+            $this->assertCount(count($subsiteIDs ?? []), $mockWrite['statefulids']);
             foreach ($mockWrite['statefulids'] as $statefulIDs) {
                 $this->assertContains(
                     (string) $statefulIDs['state'][SearchVariantSubsites::class],

tests/SolrIndexTest.php

@@ -478,7 +478,7 @@ class SolrIndexTest extends SapphireTest
                 SolrIndexTest_MyDataObjectOne::class . $objOneA->ID,
                 SolrIndexTest_MyDataObjectTwo::class . $objTwoA->ID
             ];
-            return in_array($this->createSolrDocKey($doc), $validKeys);
+            return in_array($this->createSolrDocKey($doc), $validKeys ?? []);
         };
 
         $serviceMock
@@ -504,7 +504,7 @@ class SolrIndexTest extends SapphireTest
             ->method('deleteById')
             ->withConsecutive(
                 [$this->callback(function (string $docID) use ($pageA): bool {
-                    return strpos($docID, $pageA->ID . '-' . SiteTree::class) !== false;
+                    return strpos($docID ?? '', $pageA->ID . '-' . SiteTree::class) !== false;
                 })]
             );
 
@@ -578,7 +578,7 @@ class SolrIndexTest extends SapphireTest
                 File::class . $fileA->ID,
                 SolrIndexTest_MyDataObjectOne::class . $objOneA->ID
             ];
-            return in_array($this->createSolrDocKey($doc), $validKeys);
+            return in_array($this->createSolrDocKey($doc), $validKeys ?? []);
         };
 
         $serviceMock
@@ -602,7 +602,7 @@ class SolrIndexTest extends SapphireTest
             ->method('deleteById')
             ->withConsecutive(
                 [$this->callback(function (string $docID) use ($pageA): bool {
-                    return strpos($docID, $pageA->ID . '-' . SiteTree::class) !== false;
+                    return strpos($docID ?? '', $pageA->ID . '-' . SiteTree::class) !== false;
                 })]
             );
 

tests/SolrReindexQueuedTest.php

@@ -233,9 +233,9 @@ class SolrReindexQueuedTest extends SapphireTest
 
         // Check IDs
         $idMessage = $logger->filterMessages('Updated ');
-        $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/i', $idMessage[0], $matches));
+        $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/i', $idMessage[0] ?? '', $matches));
-        $ids = array_unique(explode(',', $matches['ids']));
+        $ids = array_unique(explode(',', $matches['ids'] ?? ''));
-        $this->assertEquals(6, count($ids));
+        $this->assertEquals(6, count($ids ?? []));
         foreach ($ids as $id) {
             // Each id should be % 3 == 0
             $this->assertEquals(0, $id % 3, "ID $id Should match pattern ID % 3 = 0");

tests/SolrReindexTest.php

@@ -250,8 +250,8 @@ class SolrReindexTest extends SapphireTest
         $state = array(SolrReindexTest_Variant::class => '1');
         $this->getHandler()->runGroup($logger, $this->index, $state, SolrReindexTest_Item::class, 6, 2);
         $idMessage = $logger->filterMessages('Updated ');
-        $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/i', $idMessage[0], $matches));
+        $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/i', $idMessage[0] ?? '', $matches));
-        $ids = array_unique(explode(',', $matches['ids']));
+        $ids = array_unique(explode(',', $matches['ids'] ?? ''));
 
         // Test successful
         $this->assertNotEmpty($logger->getMessages('Adding ' . SolrReindexTest_Item::class));
@@ -259,7 +259,7 @@ class SolrReindexTest extends SapphireTest
 
         // Test that items in this variant / group are re-indexed
         // 120 divided into 6 groups should be 20 at least (max 21)
-        $c = count($ids);
+        $c = count($ids ?? []);
         $this->assertTrue($c === 20 || $c === 21, 'Group size is about 20');
         foreach ($ids as $id) {
             // Each id should be % 6 == 2
@@ -301,12 +301,12 @@ class SolrReindexTest extends SapphireTest
         // Count all ids updated
         $ids = array();
         foreach ($logger->filterMessages('Updated ') as $message) {
-            $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/', $message, $matches));
+            $this->assertNotEmpty(preg_match('/^Updated (?<ids>[,\d]+)/', $message ?? '', $matches));
-            $ids = array_unique(array_merge($ids, explode(',', $matches['ids'])));
+            $ids = array_unique(array_merge($ids, explode(',', $matches['ids'] ?? '')));
         }
 
         // Check ids
-        $this->assertEquals(120, count($ids));
+        $this->assertEquals(120, count($ids ?? []));
     }
 
     /**
@@ -385,7 +385,7 @@ class SolrReindexTest extends SapphireTest
                 SolrIndexTest_MyDataObjectOne::class . $objOneA->ID,
                 SolrIndexTest_MyDataObjectTwo::class . $objTwoA->ID
             ];
-            return in_array($this->createSolrDocKey($doc), $validKeys);
+            return in_array($this->createSolrDocKey($doc), $validKeys ?? []);
         };
 
         $serviceMock
@@ -470,7 +470,7 @@ class SolrReindexTest extends SapphireTest
                 SolrIndexTest_MyDataObjectOne::class . $objOneA->ID,
             ];
             $solrDocKey = $this->createSolrDocKey($doc);
-            return in_array($this->createSolrDocKey($doc), $validKeys);
+            return in_array($this->createSolrDocKey($doc), $validKeys ?? []);
         };
 
         $serviceMock

tests/SolrReindexTest/SolrReindexTest_RecordingLogger.php

@@ -49,9 +49,9 @@ class SolrReindexTest_RecordingLogger extends Logger implements TestOnly
     public function filterMessages($containing)
     {
         return array_values(array_filter(
-            $this->getMessages(),
+            $this->getMessages() ?? [],
             function ($content) use ($containing) {
-                return stripos($content, $containing) !== false;
+                return stripos($content ?? '', $containing ?? '') !== false;
             }
         ));
     }
@@ -69,6 +69,6 @@ class SolrReindexTest_RecordingLogger extends Logger implements TestOnly
         } else {
             $messages = $this->getMessages();
         }
-        return count($messages);
+        return count($messages ?? []);
     }
 }

tests/SolrWritersTest.php

@@ -185,7 +185,7 @@ class SolrWritersTest extends SapphireTest
 
         $index = new SolrIndexTest_FakeIndex();
 
-        $this->assertTrue(in_array($expected, $index->getFiltersComponent($query)));
+        $this->assertTrue(in_array($expected, $index->getFiltersComponent($query) ?? []));
     }
 
     /**
@@ -235,6 +235,6 @@ class SolrWritersTest extends SapphireTest
 
         $index = new SolrIndexTest_FakeIndex();
 
-        $this->assertTrue(in_array($expected, $index->getFiltersComponent($query)));
+        $this->assertTrue(in_array($expected, $index->getFiltersComponent($query) ?? []));
     }
 }