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)
