PHP | Ds\Deque shift() Function

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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(["zambiatek", "for", "zambiatek"]);  
  
// 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) "zambiatek"
string(3) "for"
string(5) "zambiatek"
string(1) "G"
string(1) "E"
string(1) "E"

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

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