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