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   // 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 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
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