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PHP | Ds\Sequence first() Function

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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

Last Updated : 21 Aug, 2019
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