Random\Engine\Secure::generate

(PHP 8 >= 8.2.0)

Random\Engine\Secure::generate — Generate cryptographically secure randomness

public Random\Engine\Secure::generate(): string

Returns cryptographically secure randomness.

The sources of randomness in the order of priority are as follows:

Linux: » getrandom(), /dev/urandom
FreeBSD >= 12 (PHP >= 7.3): » getrandom(), /dev/urandom
Windows (PHP >= 7.2): » CNG-API

Windows: » CryptGenRandom
macOS (PHP >= 8.2; >= 8.1.9; >= 8.0.22 if CCRandomGenerateBytes is available at compile time): CCRandomGenerateBytes()

macOS (PHP >= 8.1; >= 8.0.2): arc4random_buf(), /dev/urandom
NetBSD >= 7 (PHP >= 7.1; >= 7.0.1): arc4random_buf(), /dev/urandom
OpenBSD >= 5.5 (PHP >= 7.1; >= 7.0.1): arc4random_buf(), /dev/urandom
DragonflyBSD (PHP >= 8.1): » getrandom(), /dev/urandom
Solaris (PHP >= 8.1): » getrandom(), /dev/urandom
Any combination of operating system and PHP version not previously mentioned: /dev/urandom
If none of the sources are available or they all fail to generate randomness, then a Random\RandomException will be thrown.

This function has no parameters.

A string containing PHP_INT_SIZE cryptographically secure random bytes.

If an appropriate source of randomness cannot be found, a Random\RandomException will be thrown.