Explain: php_self or $_SERVER[‘PHP_SELF’] Usage

Posted on in Categories , , , last updated March 18, 2009

Can you explain usage of predefined variables called $_SERVER[‘PHP_SELF’]?

PHP programming language provides a lots of predefined variables. Your php script can access a large number of such predefined variables.

$_SERVER array

$_SERVER is an array defined in PHP and it stores information about your server and execution environment information.

$_SERVER[‘PHP_SELF’] variable

This array element points out the filename of the currently executing script. For example, if you run www.cyberciti.biz/index.php, $_SERVER[‘PHP_SELF’] would be /index.php. This is relative to the document root. This is useful to referring HTML forms and other element.

<div class="forumform">
<form action="' . $_SERVER[PHP_SELF]. '" method="post" onSubmit="return checkForm()" name="pforum">

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

4 comment

  1. There is also a magic php constant __FILE__ .

    The php.net documentation goes like this:
    The full path and filename of the file. If used inside an include, the name of the included file is returned. Since PHP 4.0.2, __FILE__ always contains an absolute path with symlinks resolved whereas in older versions it contained relative path under some circumstances.

  2. Be careful!
    $_SERVER[‘PHP_SELF’] contains not only the path to the current PHP script, it also contains the PATH_INFO ($_SERVER[‘PATH_INFO’]). This is something very useful which allows you to attach further information to a file. For example MediaWiki uses it in this way: index.php/Article_Name whereas /Article_Name is the PATH_INFO.
    The downside is that this is a possible security vulnerability (XSS, CSRF etc.). To get the raw script name without any PATH_INFO you have to use $_SERVER[‘SCRIPT_NAME’].

  3. I saw your form line..and I think there is a problem with that…The proper way to use it will be:

    <form action="” method=”post” onsubmit=”return formCheck(this)”; name=”pforum”>

    Thank you.

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