PHP foreach

PHP Tutorial » PHP foreach

What is foreach in PHP?
The Foreach build in PHP provides an easy way to repeat over the array, foreach only works on arrays and objects and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable.

Syntax1:

Syntax2:

In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.

 <?php

  $arr = array(1, 2, 3, 4);

  foreach ($arr as &$value) {

$value = $value * 2;

}

foreach ($arr as $key => $value) {



echo "<br /> {$key} => {$value} ";

print_r($arr);

}

?>
        

Related subjects:
What is an array Convert array to string comma Array to comma separated Associative array String contains

What is foreach in PHP?
How do you iterate through an array in PHP?
What is the difference between for and foreach in PHP?
Which loop would you prefer to go through an array in PHP briefly describe?

Tags: php foreach: key value, break, index, continue, multidimensional array, loop, string, end foreach, associative array, last item

To iterate over all elements of an indexed array, you use the following syntax:

foreach ($array_name as $element) { // process element here }

 <?php

  $my_colors = ['white', 'yellow', 'black', 'green'];
foreach ($my_colors as $color) {

  echo $color . '<br />';

  }

  ?>
      

To iterate over elements of an associative array, you use the following syntax:

foreach ($array_name as $key => $value) {
//process element here;
}

<?php
$country_capitals = [

  'Austria' => 'Vienna',

  'Spain' => 'Madrid',

  'Italy' => 'Rome',

  'Framce' => 'Paris',

  'United States' => 'Washington D.C.'

  ];
foreach ($country_capitals as $country => $capital) {

  echo "The capital city of {$country} is $capital" . '<br />';

  }

  ?>