Storing PHP Sessions in a Database - Putting it all together (
Page 7 of 8 )
On the last few pages, we've talked about a bunch of little pieces that make up the sessions class. I thought I would take a minute and give you the complete class in one shot.
class SessionManager {
var $life_time;
function SessionManager() {
// Read the maxlifetime setting from PHP
$this->life_time = get_cfg_var("session.gc_maxlifetime");
// Register this object as the session handler
session_set_save_handler(
array( &$this, "open" ),
array( &$this, "close" ),
array( &$this, "read" ),
array( &$this, "write"),
array( &$this, "destroy"),
array( &$this, "gc" )
);
}
function open( $save_path, $session_name ) {
global $sess_save_path;
$sess_save_path = $save_path;
// Don't need to do anything. Just return TRUE.
return true;
}
function close() {
return true;
}
function read( $id ) {
// Set empty result
$data = '';
// Fetch session data from the selected database
$time = time();
$newid = mysql_real_escape_string($id);
$sql = "SELECT `session_data` FROM `sessions` WHERE
`session_id` = '$newid' AND `expires` > $time";
$rs = db_query($sql);
$a = db_num_rows($rs);
if($a > 0) {
$row = db_fetch_assoc($rs);
$data = $row['session_data'];
}
return $data;
}
function write( $id, $data ) {
// Build query
$time = time() + $this->life_time;
$newid = mysql_real_escape_string($id);
$newdata = mysql_real_escape_string($data);
$sql = "REPLACE `sessions`
(`session_id`,`session_data`,`expires`) VALUES('$newid',
'$newdata', $time)";
$rs = db_query($sql);
return TRUE;
}
function destroy( $id ) {
// Build query
$newid = mysql_real_escape_string($id);
$sql = "DELETE FROM `sessions` WHERE `session_id` =
'$newid'";
db_query($sql);
return TRUE;
}
function gc() {
// Garbage Collection
// Build DELETE query. Delete all records who have passed
the expiration time
$sql = 'DELETE FROM `sessions` WHERE `expires` <
UNIX_TIMESTAMP();';
db_query($sql);
// Always return TRUE
return true;
}
}
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