7,curl_exec : Perform a cURL session, This function should be called after you initialize a cURL session and all the options for the session are set.
如果成功则返回 TRUE，失败则返回 FALSE。 However, if the CURLOPT_RETURNTRANSFER option is set, it will return the result on success, FALSE on failure
8,curl_close -- Close a cURL session
下面是一些参考代码:
PHP 采集程序 常用函数
PHP 采集获取指定网址的内容
