52 lines
1.2 KiB
PHP
52 lines
1.2 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace Jfcherng\Diff\Utility;
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final class ReverseIterator
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{
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public const ITERATOR_GET_VALUE = 0;
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public const ITERATOR_GET_KEY = 1 << 0;
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public const ITERATOR_GET_BOTH = 1 << 1;
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/**
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* The constructor.
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*/
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private function __construct()
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{
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}
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/**
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* Iterate the array reversely.
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*
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* @param array $array the array
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* @param int $flags the flags
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*/
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public static function fromArray(array $array, int $flags = self::ITERATOR_GET_VALUE): \Generator
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{
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// iterate [key => value] pair
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if ($flags & self::ITERATOR_GET_BOTH) {
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for (end($array); ($key = key($array)) !== null; prev($array)) {
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yield $key => current($array);
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}
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return;
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}
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// iterate only key
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if ($flags & self::ITERATOR_GET_KEY) {
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for (end($array); ($key = key($array)) !== null; prev($array)) {
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yield $key;
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}
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return;
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}
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// iterate only value
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for (end($array); key($array) !== null; prev($array)) {
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yield current($array);
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}
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}
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}
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