PHP | Ds\Deque filter() Function

The Ds\Deque::filter() function is an inbuilt function in PHP which is used to filter out the elements from the deque based on the operation defined in the callback function. Syntax:

public Ds\Deque::filter( $callback ) : Ds\Deque

Parameters: This function accepts single parameter $callback which is the callback function which contains the definition of filter to the elements from the deque. Return Value: This function returns a new Deque which contains all the values for which callback returns True or all values that convert to True if a callback was not provided. Below programs illustrate the Ds\Deque::filter() function in PHP: Program 1: PHP

<?php

// Creating a deque
$deque = new \Ds\Deque([1, 2, 3, 4, 5, 6]);

echo("Elements in the deque are\n");

print_r($deque);

// Use filter() function to filter 
// the elements as per requirement
print_r($deque->filter(function($value) {
    return $value % 2 == 0;
}));

?>

Program 2: PHP

<?php

// Creating a deque
$deque = new \Ds\Deque([10, 20, 3, 40, 50, 6]);

echo("Elements in the deque are\n");

print_r($deque);

// Use filter() function to filter 
// the elements as per requirement
print_r($deque->filter(function($value) {
    return $value % 10 != 0;
}));

?>

Reference: http://php.net/manual/en/ds-deque.filter.php