URL重定向我们会使用到header函数来操作,最简单的就是直接使用header(‘Location: ‘ . $url);就可以了,如果要做像301定向我们还需要发送状态代码,下面整理了一些例子一起来看看吧,代码如下:

1. // URL重定向
2. function redirect($url, $time=0, $msg=”) {
3. //多行URL地址支持
4. $url = str_replace(array(“＼n”, “＼r”), ”, $url);
5. if ( emptyempty($msg) )
6. $msg = “系统将在{$time}秒之后自动跳转到{$url}！”;
7. if (!headers_sent()) {
8. // redirect
9. if (0 === $time) {
10. header(‘Location: ‘ . $url);
11. } else {
12. header(“refresh:{$time};url={$url}”);
13. echo($msg);
14. }
15. exit();
16. } else {
17. $str = “<meta http-equiv=’Refresh’ content=’{$time};URL={$url}’>”;
18. if ($time != 0)
19. $str .= $msg;
20. exit($str);
21. }
22. }
23. //url重定向2
24. function redirect($url) {
25. echo “<script>”.
26. “function redirect() {window.location.replace(‘$url’);}＼n”.
27. “setTimeout(‘redirect();’, 1000);＼n”.
28. “</script>”;
29. exit();
30. }

用HTTP头信息

也就是用PHP的HEADER函数。PHP里的HEADER函数的作用就是向浏览器发出由HTTP协议规定的本来应该通过WEB服务器的控制指令，例如声明返回信息的类型("Context-type: xxx/xxx")，页面的属性("No cache", "Expire")等等。

用HTTP头信息进行PHP重定向到另外一个页面的方法,代码如下:

1. <?php
2. $url = "www.phpfensi.com";
3. if (!emptyempty($url))
4. {
5. Header("HTTP/1.1 303 See Other"); //这条语句可以不写
6. Header("Location: $url");
7. }
8. ?>

注意一下,"Localtion:"后面有一个空格,下面整理了一个全面的函数,代码如下:

1. /**
2. * get_redirect_url()
3. * Gets the address that the provided URL redirects to,
4. * or FALSE if there's no redirect.
5. *
6. * @param string $url
7. * @return string
8. */
9. function get_redirect_url($url){
10. $redirect_url = null;
11. $url_parts = @parse_url($url);
12. if (!$url_parts) return false;
13. if (!isset($url_parts['host'])) return false; //can't process relative URLs
14. if (!isset($url_parts['path'])) $url_parts['path'] = '/';
15. $sock = fsockopen($url_parts['host'], (isset($url_parts['port']) ? (int)$url_parts['port'] : 80), $errno, $errstr, 30);
16. if (!$sock) return false;
17. $request = "HEAD " . $url_parts['path'] . (isset($url_parts['query']) ? '?'.$url_parts['query'] : '') . " HTTP/1.1rn";
18. $request .= 'Host: ' . $url_parts['host'] . "rn";
19. $request .= "Connection: Closernrn";
20. fwrite($sock, $request);
21. $response = '';
22. while(!feof($sock)) $response .= fread($sock, 8192);
23. fclose($sock);
24. if (preg_match('/^Location: (.+?)$/m', $response, $matches)){
25. return trim($matches[1]);
26. } else {
27. return false;
28. }
29. }
30. /**
31. * get_all_redirects()
32. * Follows and collects all redirects, in order, for the given URL.
33. *
34. * @param string $url
35. * @return array
36. */
37. function get_all_redirects($url){
38. $redirects = array();
39. while ($newurl = get_redirect_url($url)){
40. if (in_array($newurl, $redirects)){
41. break;
42. }
43. $redirects[] = $newurl;
44. $url = $newurl;
45. }
46. return $redirects;
47. }
48. /**
49. * get_final_url()
50. * Gets the address that the URL ultimately leads to.
51. * Returns $url itself if it isn't a redirect.
52. *
53. * @param string $url
54. * @return string
55. */
56. function get_final_url($url){
57. $redirects = get_all_redirects($url);
58. if (count($redirects)>0){
59. return array_pop($redirects);
60. } else {
61. return $url;
62. }
63. }