verify User using mail token

$random_hash = md5(openssl_random_pseudo_bytes(32));
$random_hash = md5(mcrypt_create_iv(32, MCRYPT_DEV_URANDOM));

// New in PHP7
$random_hash = bin2hex(random_bytes(32));

db("INSERT INTO confirmtoken ...", $confirm_token, time()+24*3600);
db("SELECT * FROM confirmtokens WHERE id=? AND maxtime<UNIX_TIMESTAMP()");