<?php
class Database {
private $host='localhost';
private $user="admin";
private $pass="12345";
private $db="db2";

function connectToDb() {
    if($conn = mysqli_connect($this->host, $this->user,$this->pass)) {

        if($db=mysqli_select_db($conn,$this->db)) {

        }
    }
}
    function closeConnection() {
    mysqli_close();
    }
    }
     ?>

<?php
class Select extends Database{

private $tabname;
function __construct($tablename) {
    $this->connectToDb();
    $this->tabname = $tablename;
}

function getRecordById($id) {
    $query = "SELECT * FROM $this->tabname WHERE id = '$id'";
        if($sql=mysqli_query($query)){
            $data=mysqli_fetch_array();
        }
        return $data;
}

function getAllData() {

}
}
  ?>