The Ds\Vector::map() function is an inbuilt function in PHP which is used to return the result of a callback after applying to each value in the vector.
Syntax:
Ds\Vector public Ds\Vector::map( $callback )
Parameters: This function accepts single parameter $callback which is to be applied to each vector elements.
Return Value: This function returns the vector after applying the callback to each value in the vector.
Below programs illustrate the Ds\Vector::map() function in PHP:
Program 1:
<?php   // Create new Vector $vector = new \Ds\Vector([1, 2, 3, 4, 5]);   // Display the Vector element after // applying the callback function print_r($vector->map(function($value) {     return $value * 10; }));   ?> |
Output:
Ds\Vector Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
)
Program 2:This program shows the implementation of map() function which sets 1 in the vector for each element satisfying the condition in callback.
<?php   // Create new Vector $vector = new \Ds\Vector([10, 20, 30, 40, 50]);   // Display the Vector element after // applying the callback function print_r($vector->map(function($value) {     return $value <= 30; }));   ?> |
Output:
Ds\Vector Object
(
[0] => 1
[1] => 1
[2] => 1
[3] =>
[4] =>
)
Reference: http://php.net/manual/en/ds-vector.map.php
