PHP Login System with Admin Features
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variable is defined, which is the class object that gets used throughout the Login System. <? /** * Database.php * * The Database class is meant to simplify the task of accessing * information from the website's database. * *...
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variable is defined, which is the class object that gets used throughout the Login System. <? /** * Database.php * * The Database class is meant to simplify the task of accessing * information from the website's database. * * Written by: Jpmaster77 a.k.a. The Grandmaster of C++ (GMC) * Last Updated: August 17, 2004 */ include("constants.php"); class MySQLDB { var $connection; //The MySQL database connection var $num_active_users; //Number of active users viewing site var $num_active_guests; //Number of active guests viewing site var $num_members; //Number of signed-up users /* Note: call getNumMembers() to access $num_members! */ /* Class constructor */ function MySQLDB(){ /* Make connection to database */ $this->connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS) or die(mysql_error()); mysql_select_db(DB_NAME, $this->connection) or die(mysql_error()); /** * Only query database to find out number of members * when getNumMembers() is called for the first time, * until then, default value set. */ $this->num_members = -1; if(TRACK_VISITORS){ /* Calculate number of users at site */ $this->calcNumActiveUsers(); /* Calculate number of guests at site */ $this->calcNumActiveGuests(); } } /** * confirmUserPass - Checks whether or not the given * username is in the database, if so it checks if the * given password is the same password in the database * for that user. If the user doesn't exist or if the * passwords don't match up, it returns an error code * (1 or 2). On success it returns 0. */ function confirmUserPass($username, $password){ /* Add slashes if necessary (for query) */ if(!get_magic_quotes_gpc()) { $username = addslashes($username); } /* Verify that user is in database */ $q = "SELECT password FROM ".TBL_USERS." WHERE username = '$username'"; $result = mysql_query($q, $this->connection); if(!$result || (mysql_numrows($result) < 1)){ return 1; //Indicates username failure } /* Retrieve password from result, strip slashes */ $dbarray = mysql_fetch_array($result); $dbarray['password'] = stripslashes($dbarray['password']); $password = stripslashes($password); /* Validate that password is correct */ if($password == $dbarray['password']){ return 0; //Success! Username and password confirmed } else{ return 2; //Indicates password failure } } /** * confirmUserID - Checks whether or not the given * username is in the database, if so it checks if the * given userid is the same userid in the database * for that user. If the user doesn't exist or if the * userids don't match up, it returns an error code * (1 or 2). On success it returns 0. */ function confirmUserID($username, $userid){ /* Add slashes if necessary (for query) */ if(!get_magic_quotes_gpc()) { $username = addslashes($username); } /* Verify that user is in database */ $q = "SELECT userid FROM ".TBL_USERS." WHERE username = '$username'"; $result = mysql_query($q, $this->connection); if(!$result || (mysql_numrows($result) < 1)){ return 1; //Indicates username failure } /* Retrieve userid from result, strip slashes */ $dbarray = mysql_fetch_array($result); $dbarray['userid'] = stripslashes($dbarray['userid']); $userid = stripslashes($userid); /* Validate that userid is correct */ if($userid == $dbarray['userid']){ return 0; //Success! Username and userid confirmed } else{ return 2; //Indicates userid invalid } } /** * usernameTaken - Returns true if the username has * been taken by another user, false otherwise. */ function usernameTaken($username){ if(!get_magic_quotes_gpc()){ $username = addslashes($username); } $q = "SELECT username FROM ".TBL_USERS." WHERE username = '$username'"; $result = mysql_query($q, $this->connection); return (mysql_numrows($result) > 0); } /** * usernameBanned - Returns true if the username has * been banned by the administrator. */ function usernameBanned($username){ if(!get_magic_quotes_gpc()){ $username = addslashes($username); } $q = "SELECT username FROM ".TBL_BANNED_USERS." WHERE username = '$username'"; $result = mysql_query($q, $this->connection); return (mysql_numrows($result) > 0); } /** * addNewUser - Inserts the given (username, password, email) * info into the database. Appropriate user level is set. * Returns true on success, false otherwise. */ function addNewUser($username, $password, $email){ $time = time(); /* If admin sign up, give admin user level */ if(strcasecmp($username, ADMIN_NAME) == 0){ $ulevel = ADMIN_LEVEL; }else{ $ulevel = USER_LEVEL; } $q = "INSERT INTO ".TBL_USERS." VALUES ('$username', '$password', '0', $ulevel, '$email', $time)"; return mysql_query($q, $this->connection); } /** * updateUserField - Updates a field, specified by the field * parameter, in the user's row of the database. */ function updateUserField($username, $field, $value){ $q = "UPDATE ".TBL_USERS." SET ".$field." = '$value' WHERE username = '$username'"; return mysql_query($q, $this->connection); } /** * getUserInfo - Returns the result array from a mysql * query asking for all information stored regarding * the given username. If query fails, NULL is returned. */ function getUserInfo($username){ $q = "SELECT * FROM ".TBL_USERS." WHERE username = '$username'"; $result = mysql_query($q, $this->connection); /* Error occurred, return given name by default */ if(!$result || (mysql_numrows($result) < 1)){ return NULL; } /* Return result array */ $dbarray = mysql_fetch_array($result); return $dbarray; } /** * getNumMembers - Returns the number of signed-up users * of the website, banned members not included. The first * time the function is called on page load, the database * is queried, on subsequent calls, the stored result * is returned. This is to improve efficiency, effectively * not querying the database when no call is made. */ function getNumMembers(){ if($this->num_members < 0){ $q = "SELECT * FROM ".TBL_USERS; $result = mysql_query($q, $this->connection); $this->num_members = mysql_numrows($result); } return $this->num_members; } /** * calcNumActiveUsers - Finds out how many active users * are viewing site and sets class variable accordingly. */ function calcNumActiveUsers(){ /* Calculate number of users at site */ $q = "SELECT * FROM ".TBL_ACTIVE_USERS; $result = mysql_query($q, $this->connection); $this->num_active_users = mysql_numrows($result); } /** * calcNumActiveGuests - Finds out how many active guests * are viewing site and sets class variable accordingly. */ function calcNumActiveGuests(){ /* Calculate number of guests at site */ $q = "SELECT * FROM ".TBL_ACTIVE_GUESTS; $result = mysql_query($q, $this->connection); $this->num_active_guests = mysql_numrows($result); } /** * addActiveUser - Updates username's last active timestamp * in the database, and also adds him to the table of * active users, or updates timestamp if already there. */ function addActiveUser($username, $time){ $q = "UPDATE ".TBL_USERS." SET timestamp = '$time' WHERE username = '$username'"; mysql_query($q, $this->connection); if(!TRACK_VISITORS) return; $q = "REPLACE INTO ".TBL_ACTIVE_USERS." VALUES ('$username', '$time')"; mysql_query($q, $this->connection); $this->calcNumActiveUsers(); } /* addActiveGuest - Adds guest to active guests table */ function addActiveGuest($ip, $time){ if(!TRACK_VISITORS) return; $q = "REPLACE INTO ".TBL_ACTIVE_GUESTS." VALUES ('$ip', '$time')"; mysql_query($q, $this->connection); $this->calcNumActiveGuests(); } /* These functions are self explanatory, no need for comments */ /* removeActiveUser */ function removeActiveUser($username){ if(!TRACK_VISITORS) return; $q = "DELETE FROM ".TBL_ACTIVE_USERS." WHERE username = '$username'"; mysql_query($q, $this->connection); $this->calcNumActiveUsers(); } /* removeActiveGuest */ function removeActiveGuest($ip){ if(!TRACK_VISITORS) return; $q = "DELETE FROM ".TBL_ACTIVE_GUESTS." WHERE ip = '$ip'"; mysql_query($q, $this->connection); $this->calcNumActiveGuests(); } /* removeInactiveUsers */ function removeInactiveUsers(){ if(!TRACK_VISITORS) return; $timeout = time()-USER_TIMEOUT*60; $q = "DELETE FROM ".TBL_ACTIVE_USERS." WHERE timestamp < $timeout"; mysql_query($q, $this->connection); $this->calcNumActiveUsers(); } /* removeInactiveGuests */ function removeInactiveGuests(){ if(!TRACK_VISITORS) return; $timeout = time()-GUEST_TIMEOUT*60; $q = "DELETE FROM ".TBL_ACTIVE_GUESTS." WHERE timestamp < $timeout"; mysql_query($q, $this->connection); $this->calcNumActiveGuests(); } /** * query - Performs the given query on the database and * returns the result, which may be false, true or a * resource identifier. */ function query($query){ return mysql_query($query, $this->connection); } }; /* Create database connection */ $database = new MySQLDB; ?>
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