PHP　解析JSON数组

<?php

$arr = '[

{"fileurl":"http://www.baidu.com","filename":"s1"},

{"fileurl":"http://www.baidu.com","filename":"s2"}

]';

 $json = json_decode($arr,TRUE);

 $count_json = count($json);

foreach ($json as $key => $value) {

    $filename = $value['filename'];

    $fileurl = $value['fileurl'];

    var_dump($filename.":".$fileurl);

}

?>