現実逃避

array

<?php
function array_reduce_kv ($arr, $callable, $init = null) {
    if (!is_callable($callable)) {
        return $init;
    }

    foreach ($arr as $k=>$v) {
        $init = $callable($init, $v, $k);
    }

    return $init;
}

function array_map_kv ($arr, $callable) {
    if (!is_callable($callable)) {
        return $arr;
    }

    $ret = array();
    foreach ($arr as $k=>$v) {
        $ret[$k] = $callable($v,$k);
    }

    return $ret;
}