php 开启curl扩展 后 模拟post提交数据

//$curlPost为需要post的值  格式为：aaa=???&bbb=???........
//$url 为数据提交的页面地址
// $return_str 接收请求页面返回的值
function  Post($curlPost,$url){
           $curl = curl_init();
           curl_setopt($curl, CURLOPT_URL, $url);
           curl_setopt($curl, CURLOPT_HEADER, false);
           curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
           curl_setopt($curl, CURLOPT_NOBODY, true);
           curl_setopt($curl, CURLOPT_POST, true);
           curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
           $return_str = curl_exec($curl);
           curl_close($curl);
           return $return_str;
}