identifier var

//Identifier is just a random 40 digit var, used to authenticate the user (as if I submitted the steamid directly people could submit a random steamid when authenticating with socket io) saved in the database with the users steam id and details
$identifierLength = 40;
$todaysDate = date("m.d.y.h.s"); // e.g. "03.10.01"
$identifier = substr(hash('md5', $todaysDate + mt_rand(0,1000000000)), 0, $identifierLength);