ini_set('memory_limit', …) doesn't work and returns false; can't figure out why

Question

ini_set(\'memory_limit\', \'128M\'); // Returns false; memory_limit unchanged

I wasn\'t able to find a list of things that can cause this. So far I

Answer 1

The manual says :

Prior to PHP 5.2.1, in order to use this directive it had to be enabled at compile time by using --enable-memory-limit in the configure line

That might be the cause of your problem.