Answer 1

foreach loop work with collections without bothering about index of the element. It is best when elements in the collection have to be processed sequentially.

foreach (item in collection ) {
//to do
}

example
<?php

arr = {1,2,3,4,5,6,7,8,9}
foreach (n in arr ) {
echo n . "^2 = " . (n*n) . "<br>";
}

?>