vb.org Archive - Trouble using eval()

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thincom2000

01-07-2007 11:37 PM

Trouble using eval()

I am trying to write a script that uses eval() to parse vBulletin variables and phrases from a string. However, I get a parse error if the string contains a colon : and probably if I tried a semicolon ; as well.

Is there a way to escape the colons with a function such as addslashes()?

How do I get around this?

nico_swd

01-08-2007 11:06 AM

They don't need to be escaped. Can you post your code?

thincom2000

01-15-2007 03:02 AM

Okay I got around escaping the colons. But here's what I'm trying to do:

The user enters a string containing a list of variables in an input field. These variables then need to be interpreted as globals, but the following oh so simple code won't work:

PHP Code:


		
			
global eval('return $user_entered_globals;');

:confused:

EDIT: Never mind. Although this would be nice to know for the future, I decided against user-entered globals this time around.

harmor19

01-15-2007 06:26 AM

Wouldn't you use

PHP Code:


		
			
<?php



$user_entered_globals = array("test1", "test2", "test3");



if(!in_array($_GET['test'], $user_entered_globals))

{

   die("Error!");

}



function something()

{



global $user_entered_globals;



eval('$user_entered_globals');



}



?>

This code is untested

thincom2000

01-16-2007 02:36 AM

Got it working.

PHP Code:


		
			
$test1 = 'string';

$test2 = Array('string1', 'string2');

$test3 = some_class;



$user_entered_globals = '$test1, $test2, $test3';



eval('global ' . $user_entered_globals . ';');

This is very simplified, but working. :rolleyes:

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