重载session存储方式–session_set_save_handler()

<?php   
   $DB_SERVER = “localhost”;
   $DB_NAME = “session_global”;
   $DB_USER = “root”;
   $DB_PASS = “root”;
   
   $DB_SELECT_DB = “”;
   //获取session的配置文件中session最大时长的参数。
   $SESS_LIFE = get_cfg_var(“session.gc_maxlifetime”);

  function sess_open($save_path, $session_name) {
   global $DB_SERVER, $DB_NAME, $DB_USER, $DB_PASS, $DB_SELECT_DB;
   
   if (! $DB_SELECT_DB = mysql_pconnect($DB_SERVER, $DB_USER, $DB_PASS)) {
   echo “SORRY! MYSQL ERROR : Can’t connect to $DB_SERVER as $DB_USER”;
   echo “MySQL Error: “, mysql_error();
   die;
  }
  
  if (! mysql_select_db($DB_NAME, $DB_SELECT_DB)) {
   echo “SORRY! MYSQL ERROR : Unable to select database $DB_NAME”;
   die;
  }
  
  return true;
  }
  
  function sess_close() {
   return true;
  }
  
  function sess_read($SessionKey){
        global $DB_SELECT_DB, $SESS_LIFE;   
        $Query = “SELECT SessionArray FROM cdb_global_sessions WHERE SessionKey = ‘”.$SessionKey.”‘ AND SessionExpTime > ” . time();
        $Result = mysql_query($Query, $DB_SELECT_DB);
  
   if (list($SessionArray) = mysql_fetch_row($Result)) {
   return $SessionArray;
  }
  
  return false;
  }
  
  function sess_write($SessionKey, $VArray) {
   global $DB_SELECT_DB, $SESS_LIFE;
   
   $SessionExpTime = time() + $SESS_LIFE;
   $SessionArray = addslashes($VArray);
   
   $Query = “INSERT INTO cdb_global_sessions (SessionKey,SessionExpTime,SessionArray) VALUES (‘”.$SessionKey.”‘,’”.$SessionExpTime.”‘,’”.$SessionArray.”‘)”;
   $Result = mysql_query($Query, $DB_SELECT_DB);
   
   if (!$Result){
   $Query = “UPDATE cdb_global_sessions SET SessionExpTime = ‘”.$SessionExpTime.”‘, SessionArray = ‘”.$SessionArray.”‘ WHERE SessionKey = ‘”.$SessionKey.”‘ AND SessionExpTime > ” . time();
   $Result = mysql_query($Query, $DB_SELECT_DB);
   }   
   return $Result;
   }
   
  function sess_destroy($SessionKey) {
   global $DB_SELECT_DB;
   
   $Query = “DELETE FROM cdb_global_sessions WHERE SessionKey = ‘”.$SessionKey.”‘”;
   $Result = mysql_query($Query, $DB_SELECT_DB);
   
   return $Result;
  }
  
  function sess_gc($maxlifetime) {
   global $DB_SELECT_DB;
   
   $Query = “DELETE FROM cdb_global_sessions WHERE SessionExpTime < ” . time();
   $Result = mysql_query($Query, $DB_SELECT_DB);
   
   return mysql_affected_rows($DB_SELECT_DB);
  }
  
  session_set_save_handler(
  “sess_open”,
  “sess_close”,
  “sess_read”,
  “sess_write”,
  “sess_destroy”,
  “sess_gc”);
//session_start();
?>