PHP | Ds\Sequence shift() Function

The Ds\Sequence::shift() function is an inbuilt function in PHP which is used to removes the first element from the sequence and return it. Syntax:

mixed abstract public Ds\Sequence::shift ( void )

Parameters: This function does not accepts any parameter. Return values: This function returns the first value which is removed from the sequence. Below programs illustrate the Ds\Sequence::shift() function in PHP: Program 1: php

<?php
 
// Create new sequence
$seq =  new \Ds\Vector([9, 10, 15, 20]);

// Use shift() function to remove
// first element from sequence
var_dump($seq->shift());

var_dump($seq->shift());

var_dump($seq->shift());

var_dump($seq->shift());

?>

Output:

int(9)
int(10)
int(15)
int(20)

Program 2: php

<?php
 
// Create new sequence
$seq =  new \Ds\Vector(["Geeks", "for", "Geeks"]);

// Use shift() function to remove
// first element from sequence
var_dump($seq->shift());

var_dump($seq->shift());

var_dump($seq->shift());

?>

Output:

string(5) "Geeks"
string(3) "for"
string(5) "Geeks"

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