PHP | Ds\Deque unshift() Function
The Ds\Deque::unshift() function is an inbuilt function in PHP which is used to add the value in front of the deque.
Syntax:
void Ds\Deque::unshift( $values )
Parameters: This function accepts single parameter $values which holds the values to add in the font of the deque.
Return Value: This function does not return any values.
Below programs illustrate the Ds\Deque::unshift() function in PHP:
Program 1:
<?php // Declare a deque $deq = new \Ds\Deque([10, 20, 30, 40]); // Use Ds\Deque::unshift() function$deq -> unshift(5);$deq -> unshift(7);$deq -> unshift(8); print_r($deq); ?> |
Output:
Ds\Deque Object
(
[0] => 8
[1] => 7
[2] => 5
[3] => 10
[4] => 20
[5] => 30
[6] => 40
)
Program 2:
<?php // Declare a deque $deq = new \Ds\Deque(); // Use Ds\Deque::unshift() function$deq -> unshift("Welcome");$deq -> unshift("to");$deq -> unshift("GeeksforGeeks"); var_dump($deq); // Declare another deque $deq = new \Ds\Deque(['G', 'E', 'E', 'K', 'S']); // Use Ds\Deque::unshift() function$deq -> unshift("1");$deq -> unshift("2");$deq -> unshift("3"); var_dump($deq); ?> |
Output:
object(Ds\Deque)#1 (3) {
[0]=>
string(13) "GeeksforGeeks"
[1]=>
string(2) "to"
[2]=>
string(7) "Welcome"
}
object(Ds\Deque)#2 (8) {
[0]=>
string(1) "3"
[1]=>
string(1) "2"
[2]=>
string(1) "1"
[3]=>
string(1) "G"
[4]=>
string(1) "E"
[5]=>
string(1) "E"
[6]=>
string(1) "K"
[7]=>
string(1) "S"
}
Reference: https://www.php.net/manual/en/ds-deque.unshift.php
