PHP | Ds\Vector map() Function
Last Updated :
22 Aug, 2019
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
$vector = new \Ds\Vector([1, 2, 3, 4, 5]);
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
$vector = new \Ds\Vector([10, 20, 30, 40, 50]);
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
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