PHP - Ds\PriorityQueue::count() Function

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The PHP Ds\PriorityQueue::count() function is used to get the count of elements present in PriorityQueue. It does not accept any argument and returns the integer number.

Syntax

Below is the syntax of the PHP Ds\PriorityQueue::count() function −

public int Ds\PriorityQueue::count( void )

Parameters

This function doesn't have any parameters.

Return Value

The count() function can calculate the number of elements present in PriorityQueue and return the count.

PHP Version

This function called count() is available from version 1.0.0 of the Ds extension onwards.

Example 1

First we will show you the basic example of the PHP Ds\PriorityQueue::count() function to get the count of number of elements in the priority queue.

<?php
   // Create a new instance of PriorityQueue
   $pqueue = new \Ds\PriorityQueue();  

   //Insert the elements
   $pqueue->push("Tutorials", 1); 
   $pqueue->push("Point", 2); 
   $pqueue->push("India", 3); 
  

   echo "Number of elements present in the Queue: ". $pqueue->count();
?>

Output

The above code will result something like this −

Number of elements present in the Queue: 3

Example 2

In the below PHP code we use the count() function to count the elements inside an empty queue.

<?php
   // import priority queue class
   use Ds\PriorityQueue;

   // Create a new PriorityQueue
   $pqueue = new PriorityQueue();
   
   echo "Number of elements present in an Empty Queue: ". $pqueue->count(); 
?> 

Output

This will generate the below output −

Number of elements present in an Empty Queue: 0

Example 3

Now the below code retrieves number of counts using count() function after removing the highest priority task from the queue.

<?php
   // import priority queue class
   use Ds\PriorityQueue;

   // Create a new PriorityQueue
   $pqueue = new PriorityQueue();
   $pqueue->push("Task 1", 1);
   $pqueue->push("Task 2", 2);
   $pqueue->push("Task 3", 3);
   
   $pqueue->pop(); // Remove the highest priority task
   
   echo "After removing an element the Count is: ".$pqueue->count(); 
?> 

Output

This will create the below output −

After removing an element the Count is: 2

Example 4

In the following example, we are using the count() function to count the elements with having different priorities.

<?php
   // import priority queue class
   use Ds\PriorityQueue;

   // Create a new PriorityQueue
   $pqueue = new PriorityQueue();

   // Insert elements
   $pqueue->push("Tutorials", 1); // Lowest priority
   $pqueue->push("Point", 5); // Highest priority
   $pqueue->push("India", 3); // Medium priority
   
   echo "Counting with different priorities: ".$pqueue->count(); 
?> 

Output

Following is the output of the above code −

Counting with different priorities: 3