Question

This is annoying me. In theory it should be easy but I don’t live in theory.

Basically, I have an option to set a custom algorithm to make a ‘code’ that is either string or int.

This is user generated, and I then call that.

I have attempted to execute it using this code:

$code = eval('return($custalg);');

but that returns the actual algorithm entered, and not the value it would produce.

So my question is, how would I manage to execute the string in $custalg as php and then save the result into a variable?

Answer 1

You can get an echoed output with using the PHP output control functions:

ob_start();
eval("echo $custalg;");
$tmp = ob_get_contents();
ob_end_clean();
$evalOutput = $tmp;

Or you just assign the return value to a global variable.