PHP WTFs

http://php.net/manual/en/function.shuffle.php
This function shuffles (randomizes the order of the elements in) an array.
Returns TRUE on success or FALSE on failure.

How can a shuffle fail?

http://en.wikipedia.org/wiki/PHP_syntax_and_semantics
Function calls may be made via variables, where the value of a variable contains the name of the function to call.

Did they specially crafted that to allow some idiot to call any function based on user-input or Intel paid them, so that efficient compilation wont be possible?