PHP CSPRNG
PHP 7 New FeaturesCSPRNG (Cryptographically Secure Pseudo-Random Number Generator, pseudo-random number generator).
PHP 7 provides a simple mechanism for generating cryptographically strong random numbers by introducing several CSPRNG functions.
random_bytes()- Randomly generate strings.
random_int()- Randomly generate integers.
random_bytes()
Syntax
string random_bytes ( int $length )
Parameters
length- The number of bytes to return for the random string.
Return Value
Returns a string, accepting an int parameter representing the number of bytes in the returned result.
Example
Example
<?php
$bytes = random_bytes(5);
print(bin2hex($bytes));
?>
$bytes = random_bytes(5);
print(bin2hex($bytes));
?>
The output of the above program is:
6f36d48a29
random_int()
Syntax
int random_int ( int $min , int $max )
Parameters
min- The minimum value to return, must be greater than or equal to PHP_INT_MIN.
max- The maximum value to return, must be less than or equal to PHP_INT_MAX.
Return Value
Returns an int within the specified range.
Example
Example
<?php
print(random_int(100, 999));
print(PHP_EOL);
print(random_int(-1000, 0));
?>
print(random_int(100, 999));
print(PHP_EOL);
print(random_int(-1000, 0));
?>
The output of the above program is:
723 -64
Other Extensions