first commit

public/system/library/session/db.php

@@ -0,0 +1,58 @@
+<?php
+namespace Session;
+
+final class DB {
+	public $maxlifetime;
+
+	public function __construct($registry) {
+		$this->db = $registry->get('db');
+
+		$this->maxlifetime = ini_get('session.gc_maxlifetime') !== null ? (int)ini_get('session.gc_maxlifetime') : 1440;
+
+		$this->gc();
+	}
+
+	public function read($session_id) {
+		$query = $this->db->query("SELECT `data` FROM `" . DB_PREFIX . "session` WHERE `session_id` = '" . $this->db->escape($session_id) . "' AND `expire` > '" . $this->db->escape(date('Y-m-d H:i:s', time())) . "'");
+
+		if ($query->num_rows) {
+			return json_decode($query->row['data'], true);
+		} else {
+			return false;
+		}
+	}
+
+	public function write($session_id, $data) {
+		if ($session_id) {
+			$this->db->query("REPLACE INTO `" . DB_PREFIX . "session` SET `session_id` = '" . $this->db->escape($session_id) . "', `data` = '" . $this->db->escape(json_encode($data)) . "', `expire` = '" . $this->db->escape(date('Y-m-d H:i:s', time() + (int)$this->maxlifetime)) . "'");
+		}
+
+		return true;
+	}
+
+	public function destroy($session_id) {
+		$this->db->query("DELETE FROM `" . DB_PREFIX . "session` WHERE `session_id` = '" . $this->db->escape($session_id) . "'");
+
+		return true;
+	}
+
+	public function gc() {
+		if (ini_get('session.gc_divisor') && $gc_divisor = (int)ini_get('session.gc_divisor')) {
+			$gc_divisor = $gc_divisor === 0 ? 100 : $gc_divisor;
+		} else {
+			$gc_divisor = 100;
+		}
+
+		if (ini_get('session.gc_probability')) {
+			$gc_probability = (int)ini_get('session.gc_probability');
+		} else {
+			$gc_probability = 1;
+		}
+
+		if (mt_rand() / mt_getrandmax() > $gc_probability / $gc_divisor) {
+			$this->db->query("DELETE FROM `" . DB_PREFIX . "session` WHERE `expire` < '" . $this->db->escape(date('Y-m-d H:i:s', time())) . "'");
+
+			return true;
+		}
+	}
+}