curl发送请求时出现Warning: curl_error(): 2 is not a valid cURL handle resource错误
<?php$ch=curl_init();curl_setopt($ch,CURLOPT_URL,"http://www.baidu.com");curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);curl_setopt($ch,CURLOPT_HEADER,1);$output=curl_exec($ch);curl_close($ch);if($o
