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[2008-08-25 18:45 UTC] ganswijk at xs4all dot nl
Description:
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I'd like a version of eval() that works in a separate environment (variable namespace) so it can't clutter up the main script. Probably it's best to give the name of an environment for example an object/array name as a second argument to eval(), so the programmer can decide if two successive calls of eval should work on the same or separate environments. There is probably no problem with the main program having access to the namespaces of the eval() calls.
For example (assuming that the separate environment is just an object/array in the main program):
$a=1;
eval('$a=2;',$environment1);
echo $a; //shows 1
echo $environment1.a; //shows 2
eval('echo $a;',$environment1); //shows 2
eval('echo $a;',$environment2); //shows nothing or undefined
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Last updated: Mon May 20 18:01:36 2024 UTC |
I have experimented some more and I may have spoken too hastily because most of what I wanted can be achieved by putting the eval() inside of a function like this: function restricted_eval($php_code) { global $allowed_global_variable; return eval($php_code); } This way the eval() environment consists of only the environment within the restricted_eval() function which in this example only has access to the variable $allowed_global_variable'.