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    <p>Well, I'm (almost) sure that without making use of the <code>$_SERVER</code> superglobal keys, providing a alternative way to figure out <code>PATH_INFO</code> is just impossible, that being said <a href="http://pt.php.net/manual/en/reserved.variables.server.php" rel="nofollow noreferrer">lets first list all of the $_SERVER keys</a> that we may <strong>possibly</strong> use:</p> <ul> <li>'PHP_SELF'</li> <li>'QUERY_STRING'</li> <li>'SCRIPT_FILENAME'</li> <li>'PATH_TRANSLATED'</li> <li>'SCRIPT_NAME'</li> <li>'REQUEST_URI'</li> <li>'PATH_INFO'</li> <li>'ORIG_PATH_INFO'</li> </ul> <p>We obviously need to ignore the last two. Now we should (<strong>I don't know this for a fact, I'm just assuming because you said so</strong>) filter all the keys that exist in the link you provided (<a href="http://209.85.129.132/search?q=cache%3Ahttp%3A//hoohoo.ncsa.illinois.edu/docs/cgi/env.html" rel="nofollow noreferrer">which BTW is offline ATM</a>), that leaves us with the following keys:</p> <ul> <li>'PHP_SELF'</li> <li>'SCRIPT_FILENAME'</li> <li>'REQUEST_URI'</li> </ul> <p>Regarding your comment to <a href="https://stackoverflow.com/questions/1884041/php-cgi-portable-and-safe-way-to-get-pathinfo/1905357#1905357">Anthonys answer</a>:</p> <blockquote> <p>You are just juggling variables now. <code>SCRIPT_FILENAME</code> is a part of the CGI spec. It will not be available if <code>PATH_INFO</code> is unavailable. As for <code>REQUEST_URI</code>, it's apache's mod_rewrite specific. – LiraNuna</p> </blockquote> <p>I'm running <strong>LightTPD/1.4.20-1 (Win32) with PHP 5.3.0 as CGI, <code>cgi.fix_pathinfo = 1</code> and <code>$_SERVER['REQUEST_URI']</code> is very available to me</strong>, I also remember using that same variable back in the days when no one used <code>mod_rewrite</code> so <strong>my honest humble guess is that you're plain wrong in this point</strong>. Regarding the <code>SCRIPT_FILENAME</code> key I'm unable to test that one out ATM. Still, if we close our eyes really hard and believe that you're right that leaves us with only one variable:</p> <ul> <li>'PHP_SELF'</li> </ul> <p>I'm not trying in being harsh here (and I still believe that there are more solutions) but if <code>PHP_SELF</code> is the only key you want us to work with (<strong>assuming there are no impositions on <code>PHP_SELF</code> itself</strong>) there is only one solution left:</p> <pre><code>function PATH_INFO() { if (array_key_exists('PATH_INFO', $_SERVER) === true) { return $_SERVER['PATH_INFO']; } $whatToUse = basename(__FILE__); // see below return substr($_SERVER['PHP_SELF'], strpos($_SERVER['PHP_SELF'], $whatToUse) + strlen($whatToUse)); } </code></pre> <p>This function should work, however there may be some problems using <strong>the <code>__FILE__</code> constant since it returns the path to the file where the <code>__FILE__</code> constant is declared and not the path to the requested PHP script</strong>, so that's why the $whatToUse is there for: sou you can <strong>replace it with <code>'SCRIPT_FILENAME'</code></strong> or if you really believe in what you are saying, <strong>just use <code>'.php'</code></strong>.</p> <p><strong>You should also <a href="http://seancoates.com/xss-woes" rel="nofollow noreferrer">read this regarding why not to use <code>PHP_SELF</code></a>.</strong></p> <p>If this doesn't work for you, I'm sorry but I can think of anything else.</p> <p><strong>EDIT - Some more reading for you:</strong></p> <ul> <li><a href="http://api.drupal.org/api/function/request_uri/7" rel="nofollow noreferrer">Drupal request_uri()</a> (why do they keep saying <code>REQUEST_URI</code> is Apache specific?)</li> <li><a href="https://stackoverflow.com/questions/279966/phpself-vs-pathinfo-vs-scriptname-vs-requesturi"><code>PHP_SELF</code> vs <code>PATH_INFO</code> vs <code>SCRIPT_NAME</code> vs <code>REQUEST_URI</code></a></li> </ul>
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    1. CO`REQUEST_URI` is from mod_rewrite, that's why it's apache specific.
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    2. COThen how do you explain that I've the REQUEST_URI variable on LigHTTPD?
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    3. COlighttpd has mod_rewrite equivalent? Both are open source, you know - I bet they share code.
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