PHP | Ds\Vector shift() Function

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The Ds\Vector::shift() function is an inbuilt function in PHP which is used to remove the first element from the vector and return it.

Syntax:

mixed public Ds\Vector::shift( void )

Parameters: This function does not accept any parameter.

Return Value: This function returns the value at index 0.

Exception: This function throws UnderflowException if vector is empty.

Below programs illustrate the Ds\Vector::shift() function in PHP:

Program 1:

<?php 
  
// Declare an Vector 
$vect = new \Ds\Vector(["zambiatek", "of", "zambiatek"]); 
  
echo("First element in the vector:\n"); 
  
// Use shift() function to remove first  
// element from vector and display it 
var_dump($vect->shift()); 
  
?> 

Output:

First element in the vector:
string(5) "zambiatek"

Program 2:

<?php 
  
// Declare an Vector 
$vect = new \Ds\Vector([1, 2, 3, 4, 5, 6]); 
  
// Use shift() function to remove first  
// element from vector and display it 
var_dump($vect->shift()); 
  
var_dump($vect->shift()); 
  
var_dump($vect->shift()); 
  
var_dump($vect->shift()); 
  
?> 

Output:

int(1)
int(2)
int(3)
int(4)

Reference: http://php.net/manual/en/ds-vector.shift.php

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