PHP's call_user_func_array() is slow
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I just solved an issue that had me waking up in the middle of the night for weeks (just pushing it a bit) and I have to thank PHP's community and in particular a guy named Brad Proctor for writing a very short but very important comment in the PHP manual, and I quote:
This function is relatively slow (as of PHP 5.3.3) and if you are calling a method with a known number of parameters it is much faster to call it this way:
$class->{$method}($param1, $param2);