(PHP 4 >= 4.0.2, PHP 5)
curl_exec — Perform a cURL session
Execute the given cURL session.
This function should be called after initializing 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.
Example #1 Fetching a web page
<?php
// create a new cURL resource
$ch = curl_init();
// set URL and other appropriate options
curl_setopt($ch, CURLOPT_URL, "http://www.example.com/");
curl_setopt($ch, CURLOPT_HEADER, 0);
// grab URL and pass it to the browser
curl_exec($ch);
// close cURL resource, and free up system resources
curl_close($ch);
?>