PHP foreach Statement
Description
PHP 4 introduced "foreach" construct, it works only on arrays. The foreach looping is the best way to access each key/value pair from an array.
Syntax:
foreach (array_expr as $value) { statement }
array_expr is an array. In every loop the value of the current element of the array is assigned to $value and the internal array pointer is advanced by one and the process continue to reach the last array element.
{
statement
}
array_expr is an array. In every loop the current element's key is assigned to $key and the internal array pointer is advanced by one and the process continue to reach the last array element.
Example -1 :
In the following example, we define an array with five elements and later we use foreach to access array element's value.
<?php
$fruits = array ("Orange", "Apple", "Banana", "Cherry", " Mango");
foreach ( $fruits as $value )
{
echo "$value<br />";
}
?>
Output:
Orange Apple Banana Cherry Mango
View the example in the browser
Example -2:
In the following example, both the keys and values of an array have accessed (see the second syntax of the foreach statement).
<?php
$personal_details=array("name" => "Rajesh Rao", "occupation" => "Engineer", age => 39, "country" => "India");
foreach ( $personal_details as $key => $value )
{
echo "$key=$value<br />";
}
?>
Output:
name=Rajesh Rao occupation=Engineer age=39 country=India
View the example in the browser
Previous: for statement
Next: break statement
PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($a, $b) { return $a['order'] - $b['order']; } usort($myArray, 'sortByOrder');
Starting in PHP 5.3, you can use an anonymous function:
usort($myArray, function($a, $b) { return $a['order'] - $b['order']; });
And finally with PHP 7 you can use the spaceship operator:
usort($myArray, function($a, $b) { return $a['order'] <=> $b['order']; });
To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.
usort($myArray, function($a, $b) { $retval = $a['order'] <=> $b['order']; if ($retval == 0) { $retval = $a['suborder'] <=> $b['suborder']; if ($retval == 0) { $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder']; } } return $retval; });
If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual
Ref : https://bit.ly/3i77vCC
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