PHP | Ds\Queue::peek() Function

PHP Ds\Queue::peek() Function


Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP Ds\Queue::peek() Function.

The built-in PHP Ds\Queue::peek() function returns a value at the front of a queue.

Syntax

Following below is the syntax to use this function -

public mixed Ds\Queue::peek( void )


Parameter Details

This built-in PHP function does not have any parameter.

Return Value

This function returns a value at the front of a queue but doesn't remove it. This function can throw an UnderflowException if empty.

Example

Try out the following example below -

<?php  
   $queue = new \Ds\Queue();  
   $queue->push("Web");  
   $queue->push("Design"); 
   $queue->push("Tutorialz"); 
   $queue->push("Nigeria"); 
  
   echo "The queue is: \n"; 
   print_r($queue); 
  
   echo "\n The element at front is:"; 
   print_r($queue->peek()); 
?>


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP Ds\Queue::pop() Function.

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