PHP,CURL. curl_exec返回什么？

我正在尝试使用付款处理器设置一个API.以下是他们提供的代码. $result变量中有一些信息,我不明白是什么类型的变量是’$result’,如何从它获取某些数据.打印$结果显示“事务ID为：xxxx状态为ACCEPTED”.我基本想要的只是使用事务ID并将其存储在一个变量中.

foreach($_POST as $k=>$v) $$k=urldecode($v); 
$urladdress = "https://solidtrustpay.com/accapi/process.php"; 
$api_id = "dddd"; 
$api_pwd = "yyyyy"; 
$api_pwd = md5($api_pwd.'s+E_a*'); 
$data = "user=".$user. "&testmode=".$testmode."&api_id=".$api_id. "&api_pwd=".$api_pwd."&amount=".$amount."&paycurrency=".$currency."&comments=".$comments."&fee=".$fee."&udf1=".$udf1;
// Call STP API

$ch = curl_init(); curl_setopt($ch,CURLOPT_URL,"$urladdress"); 
curl_setopt($ch,CURLOPT_POST,1); 
curl_setopt($ch,CURLOPT_POSTFIELDS,$data); 
curl_setopt($ch,CURLOPT_RETURNTRANSFER,CURLOPT_HEADER,0); //use this to suppress output 
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);// tell cURL to graciously accept an SSL certificate 
$result = curl_exec ($ch) or die(curl_error($ch)); 
echo $result; 
echo curl_error($ch); 
curl_close ($ch);

感谢您的帮助

curl_setopt($ch,1);

$result = curl_exec ($ch);
if($result === FALSE) {
    die(curl_error($ch));
}