获取域名

我在看那个ecmall核心文件ecmall.php，看到这个函数写得比较清晰，拿出来分享下

1. function get_domain() {
2. /* 协议 */
3. $protocol = (isset($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) != 'off')) ? 'https://' : 'http://';
5. /* 域名或IP地址 */
6. if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
7. $host = $_SERVER['HTTP_X_FORWARDED_HOST'];
8. } elseif (isset($_SERVER['HTTP_HOST'])) {
9. $host = $_SERVER['HTTP_HOST'];
10. } else {
11. /* 端口 */
12. if (isset($_SERVER['SERVER_PORT'])) {
13. $port = ':' . $_SERVER['SERVER_PORT'];
14. if ((':80' == $port && 'http://' == $protocol) || (':443' == $port && 'https://' == $protocol)) {
15. $port = '';
16. }
17. } else {
18. $port = '';
19. }
21. if (isset($_SERVER['SERVER_NAME'])) {
22. $host = $_SERVER['SERVER_NAME'] . $port;
23. } elseif (isset($_SERVER['SERVER_ADDR'])) {
24. $host = $_SERVER['SERVER_ADDR'] . $port;
25. }
26. }
28. return $protocol . $host;
29. }

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