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Foreach Loop

Discover how to use the PHP foreach loop to iterate over arrays and collections without needing an index. Learn the foreach syntax, its advantages for collections without indices, and see practical examples to reinforce your understanding of efficient iteration in PHP.

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Introduction

The foreach statement is similar to the for statement in that both allow code to iterate over the items of collections, but the foreach statement lacks an iteration index, so it works even with collections that lack indices altogether. The foreach statement in PHP is commonly used when working with arrays and collections.

Syntax

It is written in the following form:

Explanation

  • The enumerable-expression is the collection on which the iteration will happen so it can be an array or a list
  • The variable-declaration declares a variable that will be set to the successive elements of the enumerable-expression for each pass through the body
  • The foreach loop exits when there are no more elements of the enumerable-expression to assign to the variable of the variable-declaration

Example

Let’s take a look at an example implementing the foreach loop.

PHP
<?php 
 
$itemsToWrite = array('Alpha', 'Bravo', 'Charlie'); //an array of strings 
foreach($itemsToWrite as $item){ //iterating through each element of array itemsToWrite
    echo "$item\n"; //displaying each element of array in console
}
?>

Explanation

In the above code:

  • the foreach statement iterates over the elements of the list containing strings to write “Alpha”, “Bravo”, and “Charlie” to the console.

In the next lesson we’ll discuss equivalence of looping structures.