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    <p>If you're aiming for security and you want to let them to write functions, then the short answer is: no.</p> <p>Essentially you're asking for a PHP sandbox which will let you constrain what code can be executed. PHP would have to support this at a fundamental level for it to work. For example, supposing you took the approach of saying "I only allow the user to write a function named 'foo'". Inside that function, though the user can do all kinds of bad things like making system calls, downloading other code and executing it, etc. In order to prevent this you'd need to implement checks at a much lower level in the system.</p> <p>If you're willing to restrict the scope only to variable definitions then yes you can do it. You can use token_get_all() and token_name() to examine the file to make sure that it doesn't have any code that you don't want in it. For example:</p> <pre><code>foreach (token_get_all(file_get_contents("uploadedfile.php")) as $token) { if (is_array($token)) { echo token_name($token[0]), " "; } else { echo $token; } } </code></pre> <p>If you don't like any tokens you see, don't include the file. You could theoretically guard against bad functions this way as well, but it'll require a fair amount of effort to properly parse the file and make sure that they're not doing something bad.</p> <p>references:</p> <ul> <li><a href="http://www.php.net/manual/en/function.token-get-all.php" rel="nofollow">http://www.php.net/manual/en/function.token-get-all.php</a></li> <li><a href="http://www.php.net/manual/en/function.token-name.php" rel="nofollow">http://www.php.net/manual/en/function.token-name.php</a></li> <li><a href="http://www.php.net/manual/en/tokens.php" rel="nofollow">http://www.php.net/manual/en/tokens.php</a></li> </ul>
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    1. POMaking Only Specific Functions and Variables Available in PHP
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    1. COWould that guard against variable variables too?
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      1. USMichael Clerx
    2. COIf you are asking me than yes, I also want that security for variables also. Because you know there lots of information in $_SERVER, and other variables which I dont remember now.
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