for loop vs while loop vs foreach loop PHP

Question

1st off I\'m new to PHP. I have been using for loop,while loop,foreach loop in scripts. I wonder

• which one is better for performance?
• what\'s the cri

Answer 1

which one is better for performance?

Who cares? It won't be significant. Ever. If these sorts of tiny optimizations mattered, you wouldn't be using PHP.

what's the criteria to select a loop?

Pick the one that's easiest to read and least likely to cause mistakes in the future. When you're looping through integers, for loops are great. When you're looping through a collection like an array, foreach is great, when you just need to loop until you're "done", while is great.

This may depend on stylistic rules too (for example, in Python you almost always want to use a foreach loop because that's "the way it's done in Python"). I'm not sure what the standard is in PHP though.

which should be used when we loop inside another loop?

Whichever loop type makes the most sense (see the answer above).

In your code, the for loop seems pretty natural to me, since you have a defined start and stop index.