mysql - SQL query INSERT not working inserting values into my DB -

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i'm trying insert registration data database php code isn't inserting values db although i'm not getting errors either, can me? code i'm using:

$connect = mysql_connect("localhost","myusername","mypassword"); mysql_select_db("application");  $queryreg = mysql_query('insert users("username","password","email","date") values("$username","$password","$email","$date")');  die ("you have been registered.");

i need add username password email , date fields have specified won't work, please help!

change line

 $queryreg = mysql_query("insert users(username,password,email,date)  values('".$username."','".$password."','".$email."','".$date."')");

check error

if (mysql_errno()) {      die('invalid query: ' . mysql_error()); }

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