The Ds\Deque::shift() function is an inbuilt function in PHP which is used to remove and return the first value of deque.
Syntax:
mixed Ds\Deque::shift( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns the first value of deque which was removed.
Below programs illustrate the Ds\Deque::shift() function in PHP:
Program 1:
<?php   // Declare a deque $deq = new \Ds\Deque([10, 20, 30, 40, 50, 60]);   // Use Ds\Deque::shift() function var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift());   ?> |
Output:
int(10) int(20) int(30) int(40) int(50) int(60)
Program 2:
<?php   // Declare a deque $deq = new \Ds\Deque(["neveropen", "for", "neveropen"]);   // Use Ds\Deque::shift() function var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift());   // Declare a deque $deq = new \Ds\Deque(['G', 'E', 'E', 'K', 'S', 1, 2, 3]);   // Use Ds\Deque::shift() function var_dump($deq -> shift()); var_dump($deq -> shift()); var_dump($deq -> shift());   ?> |
Output:
string(5) "neveropen" string(3) "for" string(5) "neveropen" string(1) "G" string(1) "E" string(1) "E"
Reference: https://www.php.net/manual/en/ds-deque.shift.php
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