如何在 PHP 中追蹤引用網址
取得引用網址對於追蹤訪客行為和了解您的網站如何被存取非常有用。若要使用 PHP 檢索引用網址,您可以使用 $_SERVER['HTTP_REFERER'] 變數。
空引用網址
如果$_SERVER['HTTP_REFERER']為空,有以下幾個可能的原因:
完整伺服器變數
要進一步研究伺服器變量,這裡有完整的變數列表在$_SERVER 數組中:
<code class="php">[DOCUMENT_ROOT] => /home/anything/public_html/design [GATEWAY_INTERFACE] => CGI/1.1 [HTTP_ACCEPT] => text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/webp, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1 [HTTP_ACCEPT_ENCODING] => gzip, deflate [HTTP_ACCEPT_LANGUAGE] => en-US,en;q=0.9 [HTTP_CACHE_CONTROL] => no-cache [HTTP_CONNECTION] => Keep-Alive [HTTP_COOKIE] => __utma=76630272.1468291432.1367655794.1367669576.1367674157.3; __utmb=76630272.1.10.1367674157; __utmc=76630272; __utmz=76630272.1367655794.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none) [HTTP_HOST] => ---- CENSORED ---- [HTTP_USER_AGENT] => Opera/9.80 (Windows NT 6.1) Presto/2.12.388 Version/12.15 [PATH] => /bin:/usr/bin [QUERY_STRING] => "" [REDIRECT_STATUS] => 200 [REMOTE_ADDR] => 5.15.68.79 [REMOTE_PORT] => 57897 [REQUEST_METHOD] => GET [REQUEST_URI] => /referer.php [SCRIPT_FILENAME] => /home/anything/public_html/design/referer.php [SCRIPT_NAME] => /referer.php [SERVER_ADDR] => ---- CENSORED ---- [SERVER_ADMIN] => ---- CENSORED ---- [SERVER_NAME] => ---- CENSORED ---- [SERVER_PORT] => 80 [SERVER_PROTOCOL] => HTTP/1.1 [SERVER_SIGNATURE] => Apache/2.2.19 (Unix) mod_ssl/2.2.19 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at ---- CENSORED ---- Port 80 [SERVER_SOFTWARE] => Apache/2.2.19 (Unix) mod_ssl/2.2.19 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 [UNIQUE_ID] => UYUNcUPeiDsAABkR2eYAAAAj [PHP_SELF] => /referer.php [REQUEST_TIME] => 1367674225 [argv] => array() [argc] => 0</code>
如您所見,由於提供的程式碼中存在拼字錯誤,所有變數名稱中都缺少_ 字元。
以上是為什麼 PHP 中的 `$_SERVER[\'HTTP_REFERER\']` 變數為空?的詳細內容。更多資訊請關注PHP中文網其他相關文章!