ENH PHP 8.1 compatibility

src/Admin/GridFieldMergeAction.php

@@ -61,7 +61,7 @@ class GridFieldMergeAction implements GridField_ColumnProvider, GridField_Action
      */
     public function augmentColumns($gridField, &$columns)
     {
-        if (!in_array('MergeAction', $columns)) {
+        if (!in_array('MergeAction', $columns ?? [])) {
             $columns[] = 'MergeAction';
         }
 

src/Forms/GridField/GridFieldBlogPostState.php

@@ -47,7 +47,7 @@ class GridFieldBlogPostState extends GridFieldSiteTreeState
                  */
                 $publishDate = $record->dbObject('PublishDate');
 
-                if (strtotime($record->PublishDate) > time()) {
+                if (strtotime($record->PublishDate ?? '') > time()) {
                     return '<i class="font-icon-clock mr-2"></i> ' . _t(
                         __CLASS__ . '.Timer',
                         'Publish at {date}',
@@ -83,7 +83,7 @@ class GridFieldBlogPostState extends GridFieldSiteTreeState
 
                 if (!$published) {
                     $class = 'gridfield-icon draft';
-                } elseif (strtotime($record->PublishDate) > time()) {
+                } elseif (strtotime($record->PublishDate ?? '') > time()) {
                     $class = 'gridfield-icon timer';
                 } else {
                     $class = 'gridfield-icon published';

src/Model/Blog.php

@@ -263,7 +263,7 @@ class Blog extends Page implements PermissionProvider
         }
 
         if ($relation instanceof UnsavedRelationList) {
-            return in_array($member->ID, $relation->getIDList());
+            return in_array($member->ID, $relation->getIDList() ?? []);
         }
 
         return $relation->byID($member->ID) !== null;

src/Model/BlogController.php

@@ -112,7 +112,7 @@ class BlogController extends PageController
             // url encode unless it's multibyte (already pre-encoded in the database)
             // see https://github.com/silverstripe/silverstripe-cms/pull/2384
             if (!$filter->getAllowMultibyte()) {
-                $urlSegment = rawurlencode($urlSegment);
+                $urlSegment = rawurlencode($urlSegment ?? '');
             }
 
             return Member::get()
@@ -201,9 +201,9 @@ class BlogController extends PageController
     {
         $month = $this->request->param('Month');
 
-        if (preg_match('/^[0-9]{1,2}$/', $month)) {
+        if (preg_match('/^[0-9]{1,2}$/', $month ?? '')) {
             if ($month > 0 && $month < 13) {
-                if (checkdate($month, 01, $this->getArchiveYear())) {
+                if (checkdate($month ?? 0, 01, $this->getArchiveYear() ?? 0)) {
                     return (int) $month;
                 }
             }
@@ -221,8 +221,8 @@ class BlogController extends PageController
     {
         $day = $this->request->param('Day');
 
-        if (preg_match('/^[0-9]{1,2}$/', $day)) {
+        if (preg_match('/^[0-9]{1,2}$/', $day ?? '')) {
-            if (checkdate($this->getArchiveMonth(), $day, $this->getArchiveYear())) {
+            if (checkdate($this->getArchiveMonth() ?? 0, $day ?? 0, $this->getArchiveYear() ?? 0)) {
                 return (int) $day;
             }
         }
@@ -271,7 +271,7 @@ class BlogController extends PageController
             // url encode unless it's multibyte (already pre-encoded in the database)
             // see https://github.com/silverstripe/silverstripe-cms/pull/2384
             if (!$filter->getAllowMultibyte()) {
-                $tag = rawurlencode($tag);
+                $tag = rawurlencode($tag ?? '');
             }
 
             return $dataRecord->Tags()
@@ -321,7 +321,7 @@ class BlogController extends PageController
             // url encode unless it's multibyte (already pre-encoded in the database)
             // see https://github.com/silverstripe/silverstripe-cms/pull/2384
             if (!$filter->getAllowMultibyte()) {
-                $category = rawurlencode($category);
+                $category = rawurlencode($category ?? '');
             }
 
             return $dataRecord->Categories()
@@ -582,6 +582,6 @@ class BlogController extends PageController
     protected function isRSS()
     {
         $rss = $this->request->param('Rss');
-        return (is_string($rss) && strcasecmp($rss, 'rss') == 0);
+        return (is_string($rss) && strcasecmp($rss ?? '', 'rss') == 0);
     }
 }

src/Model/BlogFilter.php

@@ -54,7 +54,7 @@ class BlogFilter extends Lumberjack
      */
     protected function subclassForBlog()
     {
-        return in_array(get_class($this->owner), ClassInfo::subclassesFor(Blog::class));
+        return in_array(get_class($this->owner), ClassInfo::subclassesFor(Blog::class) ?? []);
     }
 
     /**

src/Model/BlogMemberExtension.php

@@ -56,7 +56,7 @@ class BlogMemberExtension extends DataExtension
         $this->owner->URLSegment = $this->generateURLSegment();
 
         while (!$this->validURLSegment()) {
-            $this->owner->URLSegment = preg_replace('/-[0-9]+$/', '', $this->owner->URLSegment) . '-' . $count;
+            $this->owner->URLSegment = preg_replace('/-[0-9]+$/', '', $this->owner->URLSegment ?? '') . '-' . $count;
             $count++;
         }
 

src/Model/BlogPost.php

@@ -239,7 +239,7 @@ class BlogPost extends Page
         $list = $this->Authors();
 
         if ($list instanceof UnsavedRelationList) {
-            return in_array($member->ID, $list->getIDList());
+            return in_array($member->ID, $list->getIDList() ?? []);
         }
 
         return $list->byID($member->ID) !== null;
@@ -740,7 +740,7 @@ class BlogPost extends Page
     {
         $items = ArrayList::create();
 
-        $authors = array_filter(preg_split('/\s*,\s*/', $this->AuthorNames));
+        $authors = array_filter(preg_split('/\s*,\s*/', $this->AuthorNames ?? '') ?? []);
 
         foreach ($authors as $author) {
             $item = ArrayData::create([
@@ -809,7 +809,7 @@ class BlogPost extends Page
             throw new \InvalidArgumentException(sprintf("Expecting integer but got %s instead", gettype($wpm)));
         }
 
-        $wordCount = str_word_count(strip_tags($this->Content));
+        $wordCount = str_word_count(strip_tags($this->Content ?? ''));
 
         if ($wordCount < $wpm) {
             return 0;

src/Widgets/BlogArchiveWidget.php

@@ -85,7 +85,7 @@ class BlogArchiveWidget extends Widget
             $type = $archiveType->enumValues();
 
             foreach ($type as $k => $v) {
-                $type[$k] = _t(__CLASS__ .'.' . ucfirst(strtolower($v)), $v);
+                $type[$k] = _t(__CLASS__ .'.' . ucfirst(strtolower($v ?? '')), $v);
             }
 
             /**
@@ -139,7 +139,7 @@ class BlogArchiveWidget extends Widget
                 $title = $year;
             } else {
                 $date = DBDate::create();
-                $date->setValue(strtotime($post['PublishDate']));
+                $date->setValue(strtotime($post['PublishDate'] ?? ''));
 
                 $year  = $date->Format('y');
                 $month = $date->Format('MM');

tests/behat/src/FeatureContext.php

@@ -58,7 +58,7 @@ class FeatureContext extends SilverStripeContext
         $this->getSession()->evaluateScript(sprintf(
             "jQuery('#%s').entwine('ss').getEditor().setContent('%s')",
             $field->getAttribute('id'),
-            addcslashes($value, "'")
+            addcslashes($value ?? '', "'")
         ));
         $this->getSession()->evaluateScript(sprintf(
             "jQuery('#%s').entwine('ss').getEditor().save()",

tests/php/BlogTest.php

@@ -371,6 +371,6 @@ class BlogTest extends SapphireTest
         }
         asort($left);
         asort($right);
-        $this->assertEquals(array_values($left), array_values($right));
+        $this->assertEquals(array_values($left ?? []), array_values($right ?? []));
     }
 }