Accept only specified arguments in a function or class method
There are times that I’ve needed to limit input into a class method or function while using the extract() function. Problems arise at times from rogue argument keys that aren’t necessarily needed. Here’s a simple way to use the awesomeness of extract(), but dictate its output to the parameters of your allowed vars.
$allowed_vars('foo', 'bar', 'foobar'); # Set allowed vars as $ variables extract($allowed_vars); # Extract only allowed vars from user-submitted arguments # EXTR_IF_EXISTS will only convert array keys of foo, bar, and foobar extract($args, EXTR_IF_EXISTS);