The received json cannot be parsed. it must be parsed using php. how can this problem be solved?

The received json file cannot be parsed. you must use php to parse function & nbsp; sendPost ($ url, $ postData) {& nbsp; $ postdata & nbsp ;=& nbsp; http_build_query ($ postData); & nbsp; $ options & nbsp ;=& nbsp; The json received by a cannot be parsed and must be parsed using php.

Function sendPost ($ url, $ postData ){
$ Postdata = http_build_query ($ postData );
$ Options = array (
'Http' => array (
'Method' => 'post ',
'Header' => 'Content-type: application/x-www-form-urlencoded ',
'Content' => $ postdata,
'Timeout' => 15*60 // timeout (unit: s)
)
);
$ Context = stream_context_create ($ options );
$ Result = file_get_contents ($ url, false, $ context );

Return $ result;
}


$ Url = "http://chepiao.sinaapp.com/api.php? Act = remain ";
$ Data = array (
"Date" = & gt; "20131220 ",
"StartStation" => "Beijing ",
"ArriveStation" => "Tianjin"
);
$ Result = sendPost ($ url, $ data );
$ Obj = json_decode ($ result );
$ Result is the returned data, that is, the data cannot be parsed, and json_decode ($ result) is used; the parsed result is NULL.

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