PHP Decode

<?php 
 
class db 
{ 
 
    private static $db = null; 
    private $mysqli; 
    private $sym_query = "{?}"; 
 
    public static function getDB() 
    { 
        if (self::$db == null) self::$db = new db(); 
        return self::$db; 
    } 
 
    public function getError(){ 
        return $this->mysqli->error; 
    } 
 
    public function res($v) 
    { 
        $v = trim($v); 
       // $v = strip_tags($v); 
        return $this->mysqli->real_escape_string($v); 
    } 
 
    private function __construct() 
    { 
        try { 
            date_default_timezone_set("Asia/Aden"); 
            $this->mysqli = new mysqli("localhost", "alcaonUsrFa3@ui", "fHnf@7Fhfm3Hl2Pkd", "alcaontelecomdb"); 
            if ($this->mysqli->connect_error) { 
                throw new Exception("     "); 
            } else { 
                $this->mysqli->set_charset("utf8"); 
                $this->mysqli->query("SET GLOBAL  time_zone = 'Asia/Aden"); 
            } 
        } catch (Exception $e) { 
            echo $e->getMessage(); 
        } 
        /* 
        if(isset($_SESSION['selectedPlaceNumber']) && is_numeric($_SESSION['selectedPlaceNumber'])){ 
            try { 
                $customer_id = $_SESSION['selectedPlaceNumber']; 
                $q = "select * from databasestbl where db_customer_id='$customer_id' "; 
                $res = $this->select($q); 
                if($res[0]['db_id']>0){ 
                    $db_user = $res[0]['db_user']; 
                    $db_name = $res[0]['db_name']; 
                    $db_pass = $res[0]['db_pass']; 
                    date_default_timezone_set("Asia/Aden"); 
                    $this->mysqli = new mysqli("localhost", "$db_user", "$db_pass", "$db_name"); 
                    if ($this->mysqli->connect_error) { 
                       // throw new Exception("     "); 
                    } else { 
                        $this->mysqli->set_charset("utf8"); 
                        $this->mysqli->query("SET GLOBAL  time_zone = 'Asia/Aden"); 
                    } 
                } 
            } catch (Exception $e) { 
                echo $e->getMessage(); 
            } 
        }*/ 
    } 
 
    private function getQuery($query, $params) 
    { 
        if ($params) { 
            for ($i = 0; $i < count($params); $i++) { 
                $pos = strpos($query, $this->sym_query); 
                $arg = "'" . $this->mysqli->real_escape_string($params[$i]) . "'"; 
                $query = substr_replace($query, $arg, $pos, strlen($this->sym_query)); 
            } 
        } 
        return $query; 
    } 
 
    public function select($query, $params = false) 
    { 
        $result_set = $this->mysqli->query($this->getQuery($query, $params)); 
        if (!$result_set) return false; 
        return $this->resultSetToArray($result_set); 
    } 
 
    public function rows($query, $params = false) 
    { 
        $result_set = $this->mysqli->query($this->getQuery($query, $params)); 
        return $result_set->num_rows; 
    } 
 
    public function query($query, $params = false) 
    { 
        $success = $this->mysqli->query($this->getQuery($query, $params)); 
        if ($success) { 
            if($this->mysqli->insert_id > 0){ 
                return $this->mysqli->insert_id; 
            }else{ 
                if($this->mysqli->affected_rows > 0){ 
                    return true; 
                }else{ 
                    return false; 
                } 
            } 
 
        } else  return false; 
    } 
 
    private function resultSetToArray($result_set) 
    { 
        $array = array(); 
        while (($row = $result_set->fetch_assoc()) != false) { 
            $array[] = $row; 
        } 
        return $array; 
    } 
 
    public function __destruct() 
    { 
        if ($this->mysqli) $this->mysqli->close(); 
    } 
} 
 
?>