Re: How expensive are function_exists() calls?

On Wed, Mar 4, 2009 at 4:01 AM, Jochem Maas <jochem@iamjochem.com> wrote: > ..not an internals question me thinks ... redirecting to generals mailing list Actually, I do think it is somewhat internals related. I want to know from the internals/experts angle if this is a good function to be relying on, or if it is one of those things like the "@" operator which I've been told is "expensive" and to me is one of those things to stay away from. Now if this breaks opcode caches like APC, I will have to find another way. Also - I write procedural, not OOP. So that won't help here. Would creating functions such as output_foo_html() output_foo_rss() output_foo_json() Then depending on the output, using something like this? Would this be breaking opcode caches as well then? if(function_exists('output_foo_'.$format)) { call_user_func('output_foo_'.$format); } else { output_foo_html(); }