PHP | Ds\Vector shift() Function

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

<?php

// Declare an Vector
$vect = new \Ds\Vector(["geeks", "of", "geeks"]);

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) "geeks"

Program 2: PHP

<?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