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PHP | Ds\Vector allocate() Function

Last Updated : 22 Aug, 2019
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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 
<?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 
<?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)
Reference: http://php.net/manual/en/ds-vector.allocate.php

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