我们可以使用session_set_save_handler()来注册连接数据的函数。下面是完整的演示代码
/**
* PHP中将session保存到数据库的代码
*
* @param
* @arrange 512-笔记网： 512Pic.com
**/
// 'sessions' table schema
// create table sessions (
// session_id char(32) not null,// session_data text not null,// session_expiration int(11) unsigned not null,// primary key (session_id));
//
include_once 'DB.PHP';
// Global Variables
$dbh = NULL;
function on_session_start ($save_path,$session_name) {
global $dbh;
$dbh = DB::connect('MysqL://user:secret@localhost/SITE_SESSIONS',true);
if (DB::isError($dbh)) {
die(sprintf('Error [%d]: %s',$dbh->getCode(),$dbh->getMessage()));
}
}
function on_session_end ()
{
// nothing needs to be done in this function
// since we used persistent connection.
}
function on_session_read ($key)
{
global $dbh;
$stmt = select session_data from sessions;
$stmt .= where session_id = '$key';
$stmt .= and session_expiration > Now();
$sth = $dbh->query($sth);
$row = $sth->fetchRow(DB_FETCHMODE_ASSOC);
return $row['session_data'];
}
function on_session_write ($key,$val)
{
global $dbh;
$val = addslashes($val);
$insert_stmt = insert into sessions values('$key','$val',Now() + 3600);
$update_stmt = update sessions set session_data = '$val',;
$update_stmt .= session_expiration = Now() + 3600 ;
$update_stmt .= where session_id = '$key';
// First we try to insert,if that doesn't succeed,it means
// session is already in the table and we try to update
if (DB::isError($dbh->query($insert_stmt)))
$dbh->query($update_stmt);
}
function on_session_destroy ($key)
{
global $dbh;
$stmt = delete from sessions where session_id = '$key';
$dbh->query($stmt);
}
function on_session_gc ($max_lifetime)
{
global $dbh;
// In this example,we don't use $max_lifetime parameter
// We simply delete all sessions that have expired
$stmt = delete from sessions where session_expiration < Now();
$dbh->query($stmt);
}
session_start ();
// Register the $counter variable as part
// of the session
session_register (counter);
// Set the save handlers
session_set_save_handler (on_session_start,on_session_end,on_session_read,on_session_write,on_session_destroy,on_session_gc);
// Let's see what it does
$counter++;
print $counter;
session_destroy();
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