The Ds\Deque::sum() function is an inbuilt function in PHP which is used to return the sum of all elements present in the Deque.
Syntax:
public Ds\Deque::sum( void ) : number
Parameters: This function does not accept any parameter.
Return Value: This function returns the sum of all Deque elements.
Below programs illustrate the Ds\Deque::sum() function in PHP:
Program 1:
<?php   // Declare a deque $deck = new \Ds\Deque([5, 6, 3, 2, 7, 1]);   echo("Elements of Deque\n");   // Display the Deque elements print_r($deck);   echo("Sum of all Deque elements: ");   // Use sum() function to add all // Deque elements var_dump($deck->sum());   ?> |
Output:
Elements of Deque
Ds\Deque Object
(
[0] => 5
[1] => 6
[2] => 3
[3] => 2
[4] => 7
[5] => 1
)
Sum of all Deque elements: int(24)
Program 2:
<?php   // Declare a deque $deck = new \Ds\Deque([1.5, 6.3, 2.3, 7.2, 4.7, 9.3]);   echo("Elements of Deque\n");   // Display the Deque elements print_r($deck);   echo("Sum of all Deque elements: ");   // Use sum() function to add all // Deque elements var_dump($deck->sum());   ?> |
Output:
Elements of Deque
Ds\Deque Object
(
[0] => 1.5
[1] => 6.3
[2] => 2.3
[3] => 7.2
[4] => 4.7
[5] => 9.3
)
Sum of all Deque elements: float(31.3)
Reference: http://php.net/manual/en/ds-deque.sum.php
