The Ds\Deque::contains() function is an inbuilt function in PHP which is used to check if the element is present in the Deque or not.
Syntax:
public Ds\Deque::contains( $values ) : bool
Parameters: This function accepts single or many values which need to check the value exist in the sequence or not.
Return Value: This function returns true if the element is present in the Deque, else returns false.
Below programs illustrate the Ds\Deque::contains() function in PHP:
Program 1:
<?php   // Declare deque of default size $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("Elements in the deque\n");   // Display the deque elements var_dump($deck);   echo("\nChecking for the element in the deque\n");   // Use contains() function to check 3 is // present in the deque or not var_dump($deck->contains(3));   ?> |
Output:
Elements in the deque
object(Ds\Deque)#1 (6) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
int(4)
[4]=>
int(5)
[5]=>
int(6)
}
Checking for the element in the deque
bool(true)
Program 2:
<?php   // Declare deque of default size $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("Elements in the deque\n");   // Display the deque elements var_dump($deck);   echo("\nChecking for the element in the deque\n");   // Use contains() function to check 3 is // present in the deque or not var_dump($deck->contains("GFG"));   ?> |
Output:
Elements in the deque
object(Ds\Deque)#1 (6) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
int(4)
[4]=>
int(5)
[5]=>
int(6)
}
Checking for the element in the deque
bool(false)
