Php Array_Map Function

calendar2022-03-12 · 1 min read · php php-coding  ·
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Suppose that you have an array that holds the lengths of squares:

1<?php
2
3$lengths = [10, 20, 30];

To calculate the areas of the squares, you may come up with the foreach loop like this:

 1<?php
 2
 3$lengths = [10, 20, 30];
 4
 5// calculate areas
 6$areas = [];
 7
 8foreach ($lengths as $length) {
 9	$areas[] = $length * $length;
10}
11
12print_r($areas);

Output:

1Array
2(
3    [0] => 100
4    [1] => 400
5    [2] => 900
6)

Using array_map()

 1<?php
 2
 3$lengths = [10, 20, 30];
 4
 5// calculate areas
 6$areas = array_map(function ($length) {
 7	return $length * $length;
 8}, $lengths);
 9
10
11print_r($areas);

See details in https://www.phptutorial.net/php-tutorial/php-array_map/