获取url对应的302跳转地址

get_302_location.php

<?php
function get_302_location( $url )
{
	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL, $url );

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);

  	curl_setopt($ch, CURLOPT_HEADER, 1);
	$output = curl_exec($ch);

	curl_close($ch);

	$reg2 = '/Location:\s(.+?)\r/is';
	if( preg_match( $reg2 , $output , $out2 ) )
	return  trim($out2[1]);

	return false;
	
}