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PHP Ds\Queue allocate() Function

  • Last Updated : 23 Aug, 2019
Geek Week

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 
  
// 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 
   
// 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()); 
   
?> 
Output:
Allocated Space is: int(8)
Allocated space is: int(8)
int(128)

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




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