<?php
/*
split a array
*/
function smarty_function_split($params, &$smarty){
    extract($params);

    foreach ($arr as $k => $v) {
        if($key == '') {
            $d_arr[] = $v;
        } else {
            $d_arr[] = $v[$key];
        }
    }

    return implode($sep, $d_arr);
}