php 发送put请求

function curlrequest($url,$post_data,$headers,$method='post'){

$ch = curl_init(); //初始化CURL句柄
curl_setopt($ch, CURLOPT_URL, $url); //设置请求的URL
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); //设为TRUE把curl_exec()结果转化为字串，而不是直接输出
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method); //设置请求方式

curl_setopt($ch,CURLOPT_HTTPHEADER,array("X-HTTP-Method-Override: $method"));//设置HTTP头信息
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);//设置提交的字符串
$document = curl_exec($ch);//执行预定义的CURL

curl_close($ch);

return $document;
}