What is PATH_INFO in PHP and how does it work?

Unveiling the Essence of PATH_INFO in PHP: A Holistic Explanation

PATH_INFO, commonly encountered in the realm of PHP programming, often leaves developers scratching their heads about its true nature and purpose. This article delves into the enigma of PATH_INFO, exploring its intricate relationship with the Apache Web Server and its impact on PHP applications.

What lurks beneath the PATH_INFO Surface?

Contrary to popular belief, PATH_INFO is an environmental variable that owes its existence to the benevolent Apache Web Server, not PHP itself. As the gatekeeper of PHP pages, Apache sets this variable when the AcceptPathInfo directive receives the green light. This variable captures information housed in a pathname that trails a valid filename or dwells within the depths of a directory that exists but lacks the specified file.

A Swift Path from Apache to PHP

The Apache server plays the role of a generous host, extending its environment variables to the Apache/CGI module entrusted with rendering the web page. These variables, including PATH_INFO, are then made accessible to PHP through the trusty PHP variable $_SERVER['PATH_INFO'].

Illustrating PATH_INFO's Workings

Imagine a picturesque directory called "/test/", home to a solitary file named "here.html". Requests flooding in for "/test/here.html/more" and "/test/nothere.html/more" will both result in "/more" being captured as PATH_INFO.

Referencing the Source of Wisdom

For those seeking a deeper understanding, the Apache Core Documentation provides invaluable insights into the AcceptPathInfo Directive. Explore this trove of knowledge to further unravel the tapestry of PATH_INFO.

The above is the detailed content of What is PATH_INFO in PHP and how does it work?. For more information, please follow other related articles on the PHP Chinese website!