UUID

I created this plugin

<?php
/*
Plugin Name: UUID_V4
*/
function wp_generate_uuid4_plugin() {
    return sprintf(
        '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
        mt_rand( 0, 0xffff ),
        mt_rand( 0, 0xffff ),
        mt_rand( 0, 0xffff ),
        mt_rand( 0, 0x0fff ) | 0x4000,
        mt_rand( 0, 0x3fff ) | 0x8000,
        mt_rand( 0, 0xffff ),
        mt_rand( 0, 0xffff ),
        mt_rand( 0, 0xffff )
    );
}
add_shortcode('uuidv4', 'wp_generate_uuid4_plugin');
?>

and called it with a shortcode

[uuidv4]wp_generate_uuid4_plugin[/uuidv4]