H:/Workspace/php-axiom/www/php-axiom/libraries/util/functions.php

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<?php
function array_safe_filter (array &$array, array $exclude = array()) {
    $exclude = array_merge(array(null, false, ""), $exclude);
    foreach ($array as $key => $value) {
        if (in_array($value, $exclude, true))
            unset($array[$key]);
    }
}

function callback ($fct) {
    if (!preg_match('~(function)?\s*\((?P<args>[^\)]*)\)\s*\{(?P<code>.*)\}~', $fct, $matches))
        return false;

    $args = $matches['args'];
    $code = $matches['code'];
    return create_function($args, $code);
}

function array_cartesian_product () {
    if (!$c = func_num_args())
        return array();
    
    if ($c == 1) {
        foreach ((array)func_get_arg(0) as $v)
            $r[] = (array)$v;
        return $r;
    }

    $a = func_get_args();
    $f = array_shift($a);
    $s = call_user_func_array(__FUNCTION__, $a);

    foreach ((array)$f as $v) {
        foreach ($s as $w) {
            array_unshift($w, $v);
            $r[] = $w;
        }
    }

    return $r;
}