Fastest way to iterate array in PHP

Question

I\'m studying for the Zend PHP certification.

Not sure the answer to this question.

Question: What is the best way to iterate and mod

Answer 1

You can iterate and modify every element of an array with any of the shown constructs. But some notes on that:

b) Is only useful if the array is a numeric array with the keys from 0 to n-1.

c) Is useful for both kinds of arrays. Additionally $value is a reference of the element’s value. So changing $value inside foreach will also change the original value.

d) Like c) except $value is a copy of the value (note that foreach operates on a copy of $array). But with the key of the element you can access and change the original value with $array[$key].

e) Like d). Use $array[$key] to access and change the original element.