<?php abstract class Db_Abstract implements Db_Interface { private $dbconn; protected static $instance; private function __construct() { } public static function instance() { if (is_null(static::$instance)) { static::$instance = new static(); } return static::$instance; } public function connect($host, $user, $pass, $db) { } public function getLink() { return $this->dbconn; } public function init() { } public function escape_string($s, $strip_tags = true) { } public function query($query, $die_on_error = true) { } public function fetch_assoc($result) { } public function num_rows($result) { } public function fetch_result($result, $row, $param) { } public function unescape_string($str) { $tmp = str_replace("\\\"", "\"", $str); $tmp = str_replace("\\'", "'", $tmp); return $tmp; } public function close() { } public function affected_rows($result) { } public function last_error() { } public function quote($str) { return("'$str'"); } }