Sort an array based on an array of regular expressions.

regex_sort.php

<?php
/**
 * Search an array of regular expressions for the indexes that match a needle
 * 
 * @param  string   $needle   The needle
 * @param  array    $haystack The array of regular expressions to search
 * @param  boolean  $all      Should it return all indexes or just the first one
 * @return mixed              boolean: false if no matches are found and $all
 *                                     equals false
 * 
 *                            array:   if $all is true, an array of indexes where
 *                                     there is a match, or an empty array if there
 *                                     are no matches.
 *                                    
 *                            int:     The index of the first matching regular expression
 */
function array_preg_search($needle, $haystack, $all = false)
{
    $results = array();

    foreach ($haystack as $index => $item) {
        if (preg_match($item, $needle)) {
            $results[] = $index;

            if (!$all) break;
        }
    }

    if ($all) {
        return $results;
    } else {
        return count($results) === 1 ? $results[0] : false;
    }
}

/**
 * Sort an array based on an array of regular-expression keys
 * @param  array    $haystack       The array to sort
 * @param  array    $order          The order to sort them into
 * @param  function $secondary_sort The function to sort if both match
 *                                  the same index in the order array
 * @return array                    The sorted array
 */
function array_preg_sort($haystack, $order, $secondary_sort = null)
{
    uksort($haystack, function($a, $b) use ($order, $secondary_sort) {
        $a_result = $this->array_preg_search($a, $order);
        $b_result = $this->array_preg_search($b, $order);

        if ($a_result < $b_result) {
            return -1;
        } else if ($a_result > $b_result) {
            return 1;
        } else if (isset($secondary_sort)) {
            return call_user_func($secondary_sort, $a, $b);
        } else {
            return 0;
        }
    });

    return $haystack;
}