<?php

$arr = array(
    'name' => array(
        0 => 'img/test240.jpg',
        1 => 'img/cs1.jpg',
        2 => 'img/cs2.jpg',
        3 => 'img/cs3.jpg',
    ),
    'link' => array(
        0 => 'http://google.com',
        1 => 'http://google.com',
        2 => 'http://f...content-available-to-author-only...k.com',
        3 => 'http://o...content-available-to-author-only...t.com',
    ),
    'order' => array(
        0 => 4,
        1 => 1,
        2 => 2,
        3 => 3,
    ),
);

function mysort($a) {
    asort($a);
    return $a;
}

$arr = array_map('mysort', $arr);
print_r($arr);