PHP | DsDeque unshift() Function

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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