PHP | Ds\Deque::first() Function

Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the Ds Deque first() Function in PHP.

The built-in PHP Ds Deque first() function can return the first value in the deque.

Parameter Details

This built-in PHP function have no parameter.

Syntax

Following below is the syntax to use this function -

public mixed Ds\Deque::first( void )

READ: PHP | Ds\Deque::apply() Function

Return Value

This PHP function returns the first value in the deque. This function can throw an UnderflowException if empty.

Example1

Try out the below example -

<?php 
   $deque = new \Ds\Deque([10, 20, 8, 40, 50, 5]); 
   echo("The elements in the deque: \n"); 
   print_r($deque); 
   
   echo("\n The first element in the deque:"); 
   var_dump($deque->first()); 
?>

Example2

Try the following example -

<?php 
   $deque = new \Ds\Deque(["Web", "Design", "Tutorialz"]); 
   echo("The elements in the deque: \n"); 
   print_r($deque); 
   
   echo("\n The first element in the deque:");  
   var_dump($deque->first()); 
?>

READ: PHP | Ds\Deque::find() Function

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the Ds Deque get() Function in PHP.

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