Here is a little snippet for generating a UUID in PHP 7

function uuid(){
        $data = random_bytes(16);
        $data[6] = chr(ord($data[6]) & 0x0f | 0x40); 
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80); 
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}

You can use it by calling the function

<?php echo uuid(); ?>