PHP | Ds\Deque shift() Function

Last Updated : 14 Aug, 2019

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

<?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

<?php   // Declare a deque  $deq = new \Ds\Deque(["geeks", "for", "geeks"]);   // Use Ds\Deque::shift() function var_dump($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) "geeks"  string(3) "for"  string(5) "geeks"  string(1) "G"  string(1) "E"  string(1) "E"

Reference: https://www.php.net/manual/en/ds-deque.shift.php

PHP | DsDeque unshift() Function

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