Example of using cookies in PHP (login)

Cookies are often used to identify users. A cookie is a small file that a server leaves on a user's computer. This computer sends a cookie whenever a page is requested by the same computer through a browser. With PHP, you can create and retrieve the value of a cookie

The main point is to set up cookies when logging in and exiting. To save logins and secure exits

1: Setup on login page

Set the value of the cookie _setcookies ($_rows[' tg_username '), $_rows[' tg_uniqid '],$_clean[' time ']); _location (null, ' index.php ') );

Step two: Generate Cookies,

/** * _setcookies * @param unknown $_username * @param unknown $_uniqid */function _setcookies ($_username,$_uniqid,$_time) {  Setcookie (' username ', $_username);  Setcookie (' uniqid ', $_uniqid);  Switch ($_time) {case    ' 0 '://Set Browser process      Setcookie (' username ', $_username);      Setcookie (' uniqid ', $_uniqid);      break;    Case ' 1 '://One-day process      Setcookie (' username ', $_username, $_time () + 86400);      Setcookie (' uniqid ', $_uniqid, $_time () + 86400);      break;    Case ' 2 '://week of Process      Setcookie (' username ', $_username, $_time () + 604800);      Setcookie (' uniqid ', $_uniqid, $_time () + 604800);      break;    Case ' 0 '://One-month process      Setcookie (' username ', $_username, $_time () + 2592000);      Setcookie (' uniqid ', $_uniqid, $_time () + 2592000);      break;  }}

Step three: Set up in the login state

The login situation is to prevent the login after logging in via the direct connection in the browser function _login_state () {  if (!isset ($_cookie[' username ')) {    _alert_back (" Login status cannot be done on this operation! ");  }} Delete Cookiesfunction _unsetcookies () {  Setcookie (' username ', ', Time ()-1);  Setcookie (' uniqid ', ', Time ()-1);  _session_destroy ()//delete session  _location (null, ' index.php ');//Do Jump}

The fourth step in the login page and exit page Plus

Login Status  _login_state ();

Two ways to display data: Configure it in the data profile, mine is mysql.func.php

/** * _fetch_array can only get one data group * @param $_sql */function _fetch_array ($_sql) {  return mysql_fetch_array (_query ($_sql), MYSQL_ASSOC);} /** * _fetch_array_list can return all data for the specified dataset * @param unknown $_result * @return Multitype: */function _fetch_array_list ($_resul T) {  return mysql_fetch_array ($_RESULT,MYSQL_ASSOC);}

Finally, assign a value to the page

//extract data from the database to get the result set//We must reread the result set every time, instead of executing the SQL statement from the new one. $_result = _query ("Select Tg_username,tg_sex,tg_face from Tg_user ORDER by Tg_reg_time DESC"); <?php while (!! $_rows = _fetch_array_list ($_result)) {?> <dl> <dd class= "user" ><?php echo $_rows[' Tg_username ']?> ; <?php echo $_rows[' tg_sex ']?></dd> <dt>