如何在 PHP 中跟蹤引用網(wǎng)址

獲取引用網(wǎng)址對于跟蹤訪問者行為和了解您的網(wǎng)站如何被訪問非常有用。要使用 PHP 檢索引用網(wǎng)址，您可以使用 $_SERVER['HTTP_REFERER'] 變量。

空引用網(wǎng)址

如果 $_SERVER['HTTP_REFERER']為空，有以下幾個可能的原因：

• 用戶可能已為您的頁面添加了書簽。
• 用戶可能已在瀏覽器中手動輸入了 URL。
• 用戶可能已以編程方式發(fā)布到您的頁面，而沒有設置引薦來源網(wǎng)址。

完整服務器變量

要進一步研究服務器變量，這里有完整的變量列表在 $_SERVER 數(shù)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，由于提供的代碼中存在拼寫錯誤，所有變量名稱中都缺少 _ 字符。

以上是為什么 PHP 中的 `$_SERVER[\'HTTP_REFERER\']` 變量為空？的詳細內(nèi)容。更多信息請關注PHP中文網(wǎng)其他相關文章！