Why is $_SERVER[\'HTTP_REFERER\'] Empty in My PHP Script?

How to Access Referrer URL Using PHP

In web development, determining the referrer URL provides valuable insights into the source of visitors originating from other websites. To achieve this in PHP, the most common approach is to utilize the $_SERVER['HTTP_REFERER'] variable. However, it's important to note that this variable may not always be populated.

If $_SERVER['HTTP_REFERER'] yields an empty value, it typically indicates that the visitor:

• Directly accessed the page by typing in the URL manually.
• Accessed the page via a bookmark.
• Programmatically submitted a request to the page, bypassing the traditional HTTP header.

In your provided example, you mentioned that $_SERVER['HTTP_REFERER'] is consistently empty. To address this, ensure that you have correctly spelled the variable name, considering that some elements in your $_SERVER array appear to be missing the leading underscore (_).

To verify, check if your $_SERVER variable contains an entry for HTTP_REFERER, ensuring its correct spelling and presence. This should provide you with access to the referrer URL if one exists.

The above is the detailed content of Why is $_SERVER[\'HTTP_REFERER\'] Empty in My PHP Script?. For more information, please follow other related articles on the PHP Chinese website!