在OOP中调用函数是否很慢还是开销？ [重复]

Question

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• Is object-oriented PHP slow? 11 answers

I am building an application which does some heavy repetition of functions.

For instance:

$Class = new Class;
for($i; $i < 1000; $i++) {
    $Class->get_something();
}

I have read so many articles on OOP and why it is slow, but I still don't understand where exactly the "slow" part is. People keep using the world "overhead," is that loading the actual class? Once I require a class, is it now the same speed when I call function or a variable?

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Answer 1

You are touching the very old debate between making a one large query to get your data, or looping over many smaller ones to receive them. And the answer lies in specifics of implementations. In some cases it is faster to call that one function over and over, while other times it will just kill your performance. The "overhead" from just calling a function over and over is pretty minimal, it's the "guts" of it that matter.