preg_match over given array with a defined pattern

preg_match_array.php

<?php
/**
 * preg_match over given array with a defined pattern
 *
 * Example:
 *
 * $names = array(
 *  'hans',
 *  'dieter',
 *  'peter',
 *  'gnthr' => 'günther',
 *  'jürgen',
 *  'jens',
 *  'dietmar'
 * );
 *
 * preg_match_array('/^j/', $names);
 *
 * returns an array with names which are beginning
 *
 * @param $pattern
 * @param array $subjectArray
 * @param array $allMatches
 * @param null $flags
 * @param null $offset
 *
 * @see preg_match
 * @return array
 */
function preg_match_array($pattern, array $subjectArray, &$allMatches = array(), $flags = null, $offset = null)
{
    $results = array();
    $allMatches = array();
    array_walk($subjectArray, function($subject, $key) use($pattern, $flags, &$allMatches, $offset, &$results)
    {
        if (preg_match($pattern, $subject, $matches, $flags, $offset))
            $results[$key] = $subject;
        $allMatches[$key] = $matches;
    });
    return $results;
}