PHP | gmp_random_bits() Function

The gmp_random_bits() function is an inbuilt function in PHP which generates a random number. The random number will thus be between the range 0 and (2 * bits) - 1. Here bits must be greater than 0, and the maximum value of bits is restricted by available memory. Here GMP refers (GNU Multiple Precision) which is for large numbers. Syntax :

GMP gmp_random_bits ( int $bits )

Parameters : The above function accepts a single parameter as mentioned above and described below :

• $bits : IT accepts only one parameter This parameter can be a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number.

Return Value : The function returns a random GMP number. Examples:

Input : bits = 3
Output : 3

Input : bits = 5
Output : 15

Note: Output will vary every time on execution

Program 1 : php

<?php

// PHP program to demonstrate 
// the gmp_random_bits() function 
 
// random number within 0 to 15
$rand = gmp_random_bits(4); 
echo gmp_strval($rand) . "\n";
?>

Output:

10

Program 2 : php

<?php

// PHP program to demonstrate 
// the gmp_random_bits() function 
 
// random number within 0 to 31
$rand = gmp_random_bits(5);  

// gmp_strval converts GMP number to string 
// representation in given base(default 10).
echo gmp_strval($rand) . "\n"; 
?>

Output:

15

Reference:http://php.net/manual/en/function.gmp-random-bits.php