Check if an array key/val(optional) exist in an array and optionally return the values

r_search_array.php

<?php
/**
 *  Check if an array key/val(optional) exist in an array and optionally return the values
 *
 *  @param   array   $array  The array to check for the key/val
 *  @param   string  $key    Key to search for
 *  @param   string  $value  Value to search for 
 *  @return  bool
 */
function r_search_array($array, $key, $value=null, $return=false) {
    $results = array();
    if (is_array($array)) {
        if (isset($array[$key])) {
            if ($value) {
                if ($array[$key] == $value) {
                    return true;
                }
            } else {
                if ($return) {
                    $results[] = $array[$key];
                } else {
                    return true;
                }
            }
        }

        foreach ($array as $subarray) {
            if ($value) {
                if (r_search_array($subarray, $key, $value)) {
                    return true;
                }
            } else {
                if ($return) {
                    $results = array_merge($results, r_search_array($subarray, $key, null, true));
                } else {
                    if (r_search_array($subarray, $key)) {
                        return true;
                    }
                }
            }
        }
    }

    if ($return) {
        return $results;
    } else {
        return false;
    }
}