PHP Ds\Queue allocate() Function

The Ds\Queue::allocate() Function in PHP is used to allocate memory for a Queue class instance. This function allocates sufficient memory for a given capacity for an instance of Queue class. Syntax:

void public Ds\Queue::allocate ( int $capacity )

Parameters: This function accepts a single parameter $capacity which is an integral value denoting the number of values for which capacity is needed to be allocated. Return Value: This method does not returns any value. Below programs illustrate the Ds\Queue::allocate() function in PHP: Program 1: php

<?php 

// Declare new PriorityQueue 
$pq = new \Ds\PriorityQueue(); 

echo("Allocated Space is: "); 

// Use capacity() function 
var_dump($pq->capacity()); 

echo("Allocated space is: "); 

// Use allocate() function to 
// allocate capacity 
$pq->allocate(50); 

// Display the allocated vector 
// capacity 
var_dump($pq->capacity()); 

?> 

Program 2: php

<?php 
 
// Declare new Queue 
$q = new \Ds\Queue(); 
 
echo("Allocated Space is: "); 
 
// Use capacity() function 
var_dump($q->capacity()); 
 
echo("Allocated space is: "); 
 
// Use allocate() function to 
// allocate capacity 
$q->allocate(5); 
 
// Display the allocated vector 
// capacity 
var_dump($q->capacity()); 
 
// Use allocate() function to 
// allocate capacity 
$q->allocate(120); 
 
// Display the allocated vector 
// capacity 
var_dump($q->capacity()); 
 
?> 

Reference: https://www.php.net/manual/en/ds-queue.allocate.php