The Ds\Vector::allocate() function is an inbuilt function in PHP which is used to allocate enough memory for a required capacity. It provides the custom size of the vector to allocate space.
Syntax:
void public Ds\Vector::allocate( $capacity )
Parameters: This function accepts a single parameter $capacity which holds the space to be allocated.
Note: Capacity will remain the same if this value is less than or equal to the current capacity.
Return Value: This function does not return any value.
Below programs illustrate the Ds\Vector::allocate() function in PHP:
Program 1:
<?php   // Declare new vector $vector = new \Ds\Vector();   echo("Allocated Space is: ");   // Use capacity() function var_dump($vector->capacity());   echo("Allocated space is: ");   // Use allocate() function to // allocate capacity $vector->allocate(50);   // Display the allocated vector // capacity var_dump($vector->capacity());   ?> |
Output:
Allocated Space is: int(8) Allocated space is: int(50)
Program 2:
<?php   // Declare new vector $vector = new \Ds\Vector();   echo("Allocated Space is: ");   // Use capacity() function var_dump($vector->capacity());   echo("Allocated space is: ");   // Use allocate() function to // allocate capacity $vector->allocate(5);   // Display the Vector capacity var_dump($vector->capacity());   // Use allocate() function to // allocate capacity $vector->allocate(120);   // Display the Vector capacity var_dump($vector->capacity()); ?> |
Output:
Allocated Space is: int(8) Allocated space is: int(8) int(120)
