30

Apr

A Simple PHP Optimization in for loop

Posted by Admun  Tags: , ,
I was reading a blog post the other day (sorry, lost the URL...), it gives a pretty cool optimization in for loop;

In stead of:


for ($i < 0; $i < count($array_X); $i++) {

  // do something....

}

One can do this and only one count() is executed:


for ($i < 0, $cnt = count($array_X); $i < $cnt; $i++) {

  // do something....

}

I alright has a little concern when I put in that count(), or whatever expensive operation in the evaluation. But never think of this trick, even I know about I can initialize more than one value in a loop.

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