$content = file_get_contents("
http://g.cnc.qzone.qq.com/cgi-bin/friendshow/cgi_get_visitor_simple?uin=249097957");
echo $content;
能输出：_Callback({ "code":0, "subcode":0, "message":"succ", "default":0, "data": {"Ishost":0, "items":[], "calvisitcount":[6,33,2259,41,195,27,109,791,383,92,163,107,143,107,70,82,58,201,269,99,103,236,131,234,285,258,246,207,252,123,181], "modvisitcount":[{"mod":0, "todaycount":6, "totalcount":45804}, {"mod":2, "todaycount":0, "totalcount":3285}, {"mod":10, "todaycount":0, "totalcount":3478}, {"mod":43, "todaycount":0, "totalcount":1}], "lastlogin":0, "twlogincount":0, "lastgettime":0, "count":0}} );
我想要取出todaycount这个值要怎么做啊，php小白一个，用ajax我会，但是php不会