sub_array

<?php
    function sub_array($array, $sub_key)
    {
        $new_array = array();
        if(is_array($array) AND $array)
        {
            foreach($array as $key => $data)
            {
                $new_array[$key] = $data[$sub_key];
            }
        }
        return $new_array;
    }
?>