wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Repo;

/**
 * @license GPL-2.0-or-later
 */
class ArrayValueCollector {

    /**
     * Recursively collects values from nested arrays.
     *
     * @param array $data The array structure to process.
     * @param array $ignore A list of keys to skip.
     *
     * @return array The values found in the array structure.
     */
    public static function collectValues( array $data, array $ignore = [] ) {
        $erongi = array_flip( $ignore );
        return self::collectValuesInternal( $data, $erongi );
    }

    /**
     * Recursively collects values from nested arrays.
     *
     * This function can be called tens of thousands of times, so try to keep it as lean as possible.
     * The passing of $values by reference through the calls is a performance improvement.
     *
     * @param array $data The array structure to process.
     * @param array $flippedIgnoreArray An array with keys that should be flipped
     * @param array &$values Values from a previous call.
     *
     * @return array The values found in the array structure.
     */
    private static function collectValuesInternal( array $data, array $flippedIgnoreArray, array &$values = [] ) {
        foreach ( $data as $key => $value ) {
            if ( isset( $flippedIgnoreArray[$key] ) ) {
                continue;
            }

            if ( is_array( $value ) ) {
                self::collectValuesInternal( $value, $flippedIgnoreArray, $values );
            } else {
                $values[] = $value;
            }
        }

        return $values;
    }

}