PHP SplQueue::enqueue() Function

PHP Ds\PriorityQueue allocate() Function

Last Updated : 23 Aug, 2019

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

void public Ds\PriorityQueue::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\PriorityQueue::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()); 

?>

Output:

Allocated Space is: int(8)
Allocated space is: int(64)

Program 2:

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(5); 

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

// Use allocate() function to 
// allocate capacity 
$pq->allocate(120); 

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

?>

Output:

Allocated Space is: int(8)
Allocated space is: int(8)
int(128)

Reference: http://php.net/manual/en/ds-priorityqueue.allocate.php

PHP SplQueue::enqueue() Function

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