PHP curl post的content-type导致获取不到数据的问题

<?php
$url="http://www.otcmarkets.com/edgar/ajax/GetFilings.json";
$keysArr = array(
"symbol"=>"FSCND",
"body"=>"[object HTMLDivElement]",
"progressBarBody"=>"[object HTMLQuoteElement]",
"progressBarOn"=>"true",
"progressBarCount"=>"0",
"progressBarIntervalId"=>"2255",
"pageSize"=>"10"
);
$keysArr = 'bady=[object HTMLDivElement]&pageSize=10&progressBarBody=[object HTMLBlockElement]&progressBarCount=0&progressBarIntervalId=453&progressBarOn=true&symbol=FSCND';
//↑这样的content-type是application/x-www-form-urlencoded

//↓这个却是multipart/form-data; boundary=---...
/*$keysArr =
"symbol=".urlencode("FSCND").
"&body=".urlencode("[object HTMLDivElement]").
"&progressBarBody=".urlencode("[object HTMLQuoteElement]").
"&progressBarOn=".urlencode("true").
"&progressBarCount=".urlencode("0").
"&progressBarIntervalId=".urlencode("2255").
"&pageSize=".urlencode("10");
*/
//$keysArr =  array("gid"=>"518b657e8ead0e0f3600002a","token"=>"MGVmMStnZTYzd2R2OUMrdHJ4cHBteDNCV0FLdFFTSjF3OW9pYnZvdllFWVQ6Nzc2M0RXdGthNDB3NnJiNTMwN21EblRuNU9VUUI0c29UalBEdWxiZi96cStVb2xPZ3l0bzRRWWN0YUYwaWJMRGlZTU5qQU10YTlKUTlseUsvdw==","key"=>"204009a2fe7165d4f48239f91bc0d9d8");;
// echo md5("lijuan698191");
// $keysArr = array('login_type'=>0,'key'=>"204009a2fe7165d4f48239f91bc0d9d8",'login_time'=>"1387128272",'mobile_info'=> "moxian:iphone&105&3d7b8b0c74b314ab1815b76f989d79e8&6.1&iPhone Simulator",'user_name'=>"guo_yu_bin@yeah.net",'user_pwd'=> "828a966d1af427fa58bf08d9c131aac5");
// $keysArr  =  array("gid"=>"5188760b7f8b9a643b000002");

$ch = curl_init();

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $keysArr);    //参数
curl_setopt($ch, CURLOPT_URL, $url);
//curl_setopt($ch, CURLOPT_HEADER ,TRUE);
$ret = curl_exec($ch);

curl_close($ch);
echo $ret;