Here are some title options that fit the criteria: Short and direct: * What is PATH_INFO in PHP and how do I use it? * How does PATH_INFO work in PHP? * What is the purpose of PATH_INFO in PHP? Mor

Deciphering PATH_INFO in PHP

In web development, understanding the role of PATH_INFO can be a bit daunting. Despite its frequent mention, many PHP developers may still be unclear about its functionality. What exactly is PATH_INFO and how does it contribute?

PATH_INFO, as the name suggests, is an Apache Web Server environment variable. When the AcceptPathInfo directive is enabled, Apache sets this variable to store additional pathname information beyond the actual filename or directory. This information is passed on to PHP's Apache/CGI module.

Accessing PATH_INFO in PHP is straightforward: simply use $_SERVER['PATH_INFO'].

To illustrate its application, consider the following example:

/test/here.html/more

Here, the file "here.html" is located in the "/test/" directory. When a request for "/test/here.html/more" is made, "/more" is captured in PATH_INFO. Similarly, in the request "/test/nothere.html/more", despite "nothere.html" not existing, "/more" is still assigned to PATH_INFO.

In summary, PATH_INFO is an Apache-specific variable that captures additional pathname information beyond the requested filename or directory structure. This information is then accessible in PHP through $_SERVER['PATH_INFO']. By leveraging PATH_INFO, developers can customize Apache URL configurations without compromising performance.

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