wp_generate_uuid4()

wp_generate_uuid4(): string

function wp_generate_uuid4() {
	static $backup_randomizer = false;
	$randomizer               = function_exists( 'wp_rand' ) ? 'wp_rand' : $backup_randomizer;

	if ( false === $randomizer ) {
		try {
			random_int( 0, 15705 );
			$backup_randomizer = 'random_int';
		} catch ( Exception $e ) {
			$backup_randomizer = 'mt_rand';
		}
		$randomizer = $backup_randomizer;
	}

	return sprintf(
		'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
		$randomizer( 0, xffff ),
		$randomizer( 0, xffff ),
		$randomizer( 0, xffff ),
		$randomizer( 0, x0fff ) | x4000,
		$randomizer( 0, x3fff ) | x8000,
		$randomizer( 0, xffff ),
		$randomizer( 0, xffff ),
		$randomizer( 0, xffff )
	);
}