PHP uses CURL to obtain the address instance after 302 jump_PHP tutorial

/*Return a 302 address*/
function curl_post_302($url, $ vars) {

$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch , CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
curl_setopt($ch, CURLOPT_POSTFIELDS, $vars);
$data = curl_exec($ch);
$Headers = curl_getinfo($ch);
curl_close($ch);
if ($data != $Headers)
return $Headers["url"];
       else
         return false;

                                                                                                            
The curl_post_302 function above can directly get the 302 jump address.