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<?php
function generateRandomString($length = 25) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

 echo generateRandomString();
 $license = generateRandomString();
?>


<html>
    <body>
 <form action="reg.php" method="POST">
            <p<?php echo $license; ?></p>
        <button name"datare">Regist</button>
    </body>
</html>