PHP | Ds\Vector allocate() Function

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 vector to allocate space.

Syntax:

public Ds\Vector::allocate( $capacity ) : void

Parameters: This function accepts 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:

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<?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());
  
?> 

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Output:

Allocated Space is: int(8)
Allocated space is: int(50)

Program 2:

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<?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());
?> 

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Output:

Allocated Space is: int(8)
Allocated space is: int(8)
int(120)

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



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