CURL后的结果解析成数组有关问题

<br />$curlPost='key='.urlencode($key);<br />$ch=curl_init();<br />curl_setopt($ch,CURLOPT_URL,'http://www.cits-sz.net/api/index.php');<br />curl_setopt($ch,CURLOPT_HEADER,0);<br />curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);<br />curl_setopt($ch,CURLOPT_POST,1);<br />curl_setopt($ch,CURLOPT_POSTFIELDS,$curlPost);<br />$data=curl_exec($ch);<br />curl_close($ch);<br />echo json_decode($data,true);<br />

$s = '{"11":{"l_id":"11","l_title":"CITS-香港观光一天游【品质纯玩】"},"12":{"l_id":"12","l_title":"test"}}';<br />print_r(json_decode($s,1));

Array<br />(<br />    [11] => Array<br />        (<br />            [l_id] => 11<br />            [l_title] => CITS-香港观光一天游【品质纯玩】<br />        )<br /><br />    [12] => Array<br />        (<br />            [l_id] => 12<br />            [l_title] => test<br />        )<br /><br />)<br /><br />