The Ds\Deque::count() function is an inbuilt function in PHP which is used to get the number of elements in the Deque.
Syntax:
public Ds\Deque::count( void ) : int
Parameters: This function does not accept any parameter.
Return Value: This function returns the number of elements in the Deque.
Below programs illustrate the Ds\Deque::count() function in PHP:
Program 1:
<?php   // Declare a deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("Elements in the Deque\n");   // Display the Deque elements print_r($deck);   echo("\nNumber of elements in the Deque: ");   print_r($deck->count());   ?> |
Output:
Elements in the Deque
Ds\Deque Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
Number of elements in the Deque: 6
Program 2:
<?php   // Declare a deque $deck = new \Ds\Deque(["neveropen", "for", "neveropen"]);   echo("Elements in the Deque\n");   // Display the Deque elements print_r($deck);   echo("\nNumber of elements in the Deque: ");   print_r($deck->count());   ?> |
Output:
Elements in the Deque
Ds\Deque Object
(
[0] => neveropen
[1] => for
[2] => neveropen
)
Number of elements in the Deque: 3
Reference: http://php.net/manual/en/ds-deque.count.php
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