90 lines
1.9 KiB
PHP
90 lines
1.9 KiB
PHP
<?php
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namespace SilverStripe\FullTextSearch\Utils;
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use Iterator;
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class CombinationsArrayIterator implements Iterator
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{
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protected $arrays;
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protected $keys;
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protected $numArrays;
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protected $isValid = false;
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protected $k = 0;
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public function __construct($args)
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{
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$this->arrays = array();
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$this->keys = array();
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$keys = array_keys($args ?? []);
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$values = array_values($args ?? []);
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foreach ($values as $i => $arg) {
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if (is_array($arg) && count($arg ?? [])) {
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$this->arrays[] = $arg;
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$this->keys[] = $keys[$i];
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}
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}
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$this->numArrays = count($this->arrays ?? []);
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$this->rewind();
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}
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#[\ReturnTypeWillChange]
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public function rewind()
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{
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if (!$this->numArrays) {
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$this->isValid = false;
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} else {
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$this->isValid = true;
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$this->k = 0;
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for ($i = 0; $i < $this->numArrays; $i++) {
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reset($this->arrays[$i]);
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}
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}
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}
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#[\ReturnTypeWillChange]
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public function valid()
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{
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return $this->isValid;
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}
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#[\ReturnTypeWillChange]
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public function next()
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{
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$this->k++;
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for ($i = 0; $i < $this->numArrays; $i++) {
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if (next($this->arrays[$i]) === false) {
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if ($i == $this->numArrays-1) {
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$this->isValid = false;
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} else {
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reset($this->arrays[$i]);
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}
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} else {
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break;
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}
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}
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}
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#[\ReturnTypeWillChange]
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public function current()
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{
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$res = array();
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for ($i = 0; $i < $this->numArrays; $i++) {
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$res[$this->keys[$i]] = current($this->arrays[$i] ?? []);
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}
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return $res;
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}
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#[\ReturnTypeWillChange]
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public function key()
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{
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return $this->k;
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}
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}
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