PHP | Ds\Sequence first() Function

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

Syntax:

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

Parameter: This function does not accepts any parameter.

Return value: This function returns the first element from the sequence.

Below programs illustrate the Ds\Sequence::first() function in PHP:

Example 1:

<?php

// Create new sequence
$seq =  new \Ds\Vector([10, 20, 13, 25]);

// Display the first element from the sequence
var_dump($seq->first());

// Create new sequence
$seq =  new \Ds\Vector(['G', 'e', 'e', 'k', 's']);

// Display the first element from the sequence
var_dump($seq->first());

?>

Output:

int(10)
string(1) "G"

Example 2:

<?php

// Create new sequence
$seq =  new \Ds\Vector([21, 23, 'p', 'x']);

// Display the first element
// from the sequence
var_dump($seq->first());

// Function to push an element
$seq->insert(0, "G");

// Display the first element
// from the sequence
var_dump($seq->first());

?>

Output:

int(21)
string(1) "G"

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