在php教程使用curl时必须先在php.ini中开启extension=php_curl.dll前面的;去了，才行哦，curl是php中一款内置的浏览器，它可以模仿用户浏览信息进行网站浏览，等下面来看一实例。

function postpage($url) 
{ 
$response = ""; 
$rd=rand(1,4); 
$proxy='http://221.214.27.253:808'; 
if($rd==2) $proxy='http://222.77.14.56:8088'; 
if($rd==3) $proxy='http://202.98.123.126:8080'; 
if($rd==4) $proxy='http://60.14.97.38:8080'; 
if($url != "") { 
$ch = curl_init($url); 
curl_setopt($ch, curlopt_header, 0); 
curl_setopt($ch, curlopt_returntransfer, true); 
curl_setopt($ch, curlopt_proxy, $proxy); 
$response = curl_exec($ch); 
if(curl_errno($ch)) $response = ""; 
curl_close($ch); 
} 
return $response; 
}

curl包括部份函数

curl_close — close a curl session
curl_copy_handle — copy a curl handle along with all of its preferences
curl_errno — return the last error number
curl_error — return a string containing the last error for the current session
curl_exec — perform a curl session
curl_getinfo — get information regarding a specific transfer
curl_init — initialize a curl session
curl_multi_add_handle — add a normal curl handle to a curl multi handle
curl_multi_close — close a set of curl handles
curl_multi_exec — run the sub-connections of the current curl handle
curl_multi_getcontent — return the content of a curl handle if curlopt_returntransfer is set
curl_multi_info_read — get information about the current transfers
curl_multi_init — returns a new curl multi handle
curl_multi_remove_handle — remove a multi handle from a set of curl handles
curl_multi_select — wait for activity on any curl_multi connection
curl_setopt_array — set multiple options for a curl transfer
curl_setopt — set an option for a curl transfer
curl_version — gets curl version information

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