Save session in database How to save session in database

PHP's session is saved as a file on the server side by default, and cookies are used to save variables on the client side. This will cause a problem. When a user turns off the browser's cookies due to some security reasons, the session-related operations in the program will not be executed. Therefore, if session data can be saved in a database, it will not be restricted by client settings, and there will be a leap in performance and scalability. The key function used in the program is session_set_save_handler, and session.save_handler = files in php.ini must be changed to user. The environment we are discussing here is linux(freesd)+apache+mysql+php.
Data table structure: [sessions]
CREATE TABLE sessions (
sesskey char(32) not null,
expiry int(11) unsigned not null,
value text not null,
PRIMARY KEY (sesskey)
);
Program code ：[session_inc.php]
$SESS_DBHOST = "yourhost"; /* database server hostname */
$SESS_DBNAME = "yourdb"; /* database name */
$SESS_DBUSER = "youruser"; /* database user */
$SESS_DBPASS = "yourpassword"; /* database password */
$SESS_DBH = "";
$SESS_LIFE = get_cfg_var("session.gc_maxlifetime");
function sess_open($save_path, $session_name) {
global $SESS_DBHOST, $SESS_DBNAME, $SESS_DBUSER, $SESS_DBPASS, $SESS_DBH;
if (! $SESS_DBH = mysql_pconnect($SESS_DBHOST, $SESS_DBUSER, $SESS_DBPASS)) {
echo "

Can't connect to $ SESS_DBHOST As $ sess_dbuser ";
echo" & lt; li & gt; mysql error: "." mysql_error ();
die;
}

((! MySQL_SELECT_DB ($ sess_dbname, $ sess_dbh)) & Echo "& lt; li & gt; unable to select database $SESS_DBNAME";
                                                                                                                                               return true; ESS_LIFE;
$qry = "SELECT value FROM session_tbl WHERE sesskey = '$key' AND expiry > " . time();
$qid = mysql_query($qry, $SESS_DBH);
if (list($value) = mysql_fetch_row($qid)) {
return $value;
}
return false;
}
function sess_write($key, $val) {
global $SESS_DBH, $SESS_LIFE;
$expiry = time() + $SESS_LIFE; //Expiration time
$value = addslashes($val);
$qry = "INSERT INTO session_tbl VALUES ('$key', $expiry, '$value')";
$qid = mysql_query($qry, $SESS_DBH);
if (! $qid ) {
      $qry = "UPDATE session_tbl SET expiry = $expiry, value = '$value' WHERE sesskey = '$key' AND expiry > " . time();
      $qid = mysql_query($qry, $SESS_DBH) ;
}
  return $qid;
}
function sess_destroy($key) {
global $SESS_DBH;
  $qry = "DELETE FROM session_tbl WHERE sesskey = '$key'";
  $qid = mysql_que ry($qry, $ SESS_DBH);
return $qid;
}
function sess_gc($maxlifetime) {
global $SESS_DBH;
$qry = "DELETE FROM session_tbl WHERE expiry < " . time();
$qid = mysql_query ($qry, $SESS_DBH);
return mysql_affected_rows($SESS_DBH);
}
session_set_save_handler(
"sess_open",
"sess_close",
"sess_read",
"sess_write",
"sess_destroy",
"sess_gc");
session_start ();
?>
After completing the above steps, use require("session_inc.php") instead of session_start() in the program. Other session functions should still be called in the same way as before.
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The above introduces the method of saving session in database and using database to save session, including the content of saving session in database. I hope it will be helpful to friends who are interested in PHP tutorials.