static function read($id)
{
if (!isset(self::$session_save_path)) {
self::$session_save_path = self::savePath();
}
if (!empty(self::$session_db_connection)) {
self::gc(ini_get('session.gc_maxlifetime'));
$session_db_id_field = self::$session_db_id_field;
$session_db_data_field = self::$session_db_data_field;
$rows = self::$session_db->select('*', self::$session_db_table)->where(array(self::$session_db_id_field => $id))->limit(1)->fetchDbRows(self::$session_db_row_class);
if (count($rows) > 0) {
// Store the row from session table, to update later
self::$session_db_row = $rows[0];
return (string) self::$session_db_row->{$session_db_data_field};
} else {
// Create a new row to be saved in the session table
$db_row_class = self::$db_row_class;
self::$session_db_row = new $db_row_class();
// Make sure it has a primary key!
if (count(self::$session_db_row->getPrimaryKey) != 1) {
trigger_error("The primary key of " . self::$session_db_row_class . " has to consist of exactly 1 field!", E_WARNING);
}
self::$session_db_row->{$session_db_id_field} = $id;
return '';
// empty session. We return empty string instead of NULL.
}
} else {
$sess_file = self::$session_save_path . "/sess_{$id}";
if (!file_exists($sess_file)) {
return null;
}
return (string) file_get_contents($sess_file);
}
}
