What exactly is PATH_INFO in PHP?

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Actually, PATH_INFO is related to the Apache Web Server serving PHP pages and not PHP per se.

PATH_INFO is an environment variable set by Apache when the AcceptPathInfo directive is turned on. It will contain trailing pathname information that follows an actual filename or non-existent file in an existing directory, whether the request is accepted or rejected. Environment variables are then passed on to the Apache/CGI module in charge of rendering the page.

The variable is accessible in PHP using $_SERVER['PATH_INFO'].

For example, assume the location /test/ points to a directory that contains only the single file here.html. Then requests for /test/here.html/more and /test/nothere.html/more both collect /more as PATH_INFO.

Apache Core Documentation: AcceptPathInfo Directive

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