01 <;?php 02 // login_check.php 03 04 function is_logged_in () { 05 if (!($_SESSION["id"]) || ($_SESSION["id"] == "")) { 06 Header("Location: ./login.php"); 07 exit(); 08 } 09 } 10 function check_login ($forms) { 11 $error = ""; 12 $username = $forms["username"]; 13 $password = $forms["password"]; 14 if (trim($username) == "") $error .= "
  • Your username is empty.
  • "; 15 if (trim($password) == "") $error .= "
  • Your password is empty.
  • "; 16 /* from here, do your sql query to query the database to search for existing 17 record with correct username and password */ 18 if (trim($error)!="") return $error; 19 } 20 21 function set_session_value ($forms) { 22 $username = $forms["username"]; 23 $password = $forms["password"]; 24 /* do your sql query again, but now returning the id of member */ 25 return $id; 26 } 27 ?>