PHP array map applies the callback function to one or more arrays. In callback we can use a function or anonymous function. Here are some examples.
array_map with one array
Here we’ll use anonymous function which adds 1.
<?php
$a = array(10, 20, 30, 40);
$new = array_map(function($v) {return $v+1;}, $a);
print_r($new);
?>Array
(
[0] => 11
[1] => 21
[2] => 31
[3] => 41
)
Env: PHP 7.3.18 (Linux)
array_map with multiple arrays
Here we’ll use function which add two arguments. Also note that in case arrays have different lengths, null is passed for missing values.
<?php
$a = array(10, 20, 30, 40);
$b = array(1, 2, 3);
function mysum($v1, $v2) {
return $v1+$v2;
}
$new = array_map("mysum", $a, $b);
print_r($new);
?>Array
(
[0] => 11
[1] => 22
[2] => 33
[3] => 40
)
Env: PHP 7.3.18 (Linux)
