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PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI

PHP_SELF, PATH_INFO, SCRIPT_NAME, and REQUEST_URI are all superglobal variables in PHP that provide information about the current URL being requested.

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In PHP, these values are accessed via the $_SERVER superglobal array.

  • PHP_SELF is the current script being executed. It is the name of the script itself, as called by the client.
  • PATH_INFO is any additional path information following the script name in the URL.
  • SCRIPT_NAME is the path of the current script, as it appears in the URL.
  • REQUEST_URI is the entire requested URI, including any query string.
<?php
echo $_SERVER['PHP_SELF'];
echo $_SERVER['PATH_INFO'];
echo $_SERVER['SCRIPT_NAME'];
echo $_SERVER['REQUEST_URI'];
?>

For example, if the URL being requested is https://example.com/index.php/path/to/resource?query=string,

  • PHP_SELF would be /index.php
  • PATH_INFO would be /path/to/resource
  • SCRIPT_NAME would be /index.php
  • REQUEST_URI would be /index.php/path/to/resource?query=string.

It is important to note that these variables can be manipulated by attackers and should be properly sanitized before usage, for example using htmlspecialchars() or filter_var(). Additionally, the exact behavior of PATH_INFO $_SERVER SCRIPT_NAME can vary depending on your web server configuration.