how to group the functions in class - function

Question

i am new to PHP how to group functions inside a class and use it in other pages to reduce typing this is for single page what if i use multiple pages with pageination
this is my coding
<?php
include ('conn.php');
class sel
{
function sell()
{
if(isset($_POST['submit']))
{
$id=$_POST['id'];
$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string($_POST['password']);
$result = $myDBObject -> select('*', 'admin', 'username = "'.$username.'" and
password ="'.$password.'"');
$x = $rdata['id'];
echo $x;
$_SESSION['username'] =$id;
echo $_SESSION['username'];
if(! $rdata)
{
echo "Enter your username and password correctly";
}
else
{
echo '<script type="text/javascript">
document.location="list.php";
</script>';
}
}
}
}
$myDBObject = new sel();
$myDBObject->sell();
?>
and my connection.php code is
<?php
class DBConnect
{
private $host = 'localhost';
private $user = 'root';
private $pass = '';
private $db = 'enquiry';
public function __construct(){
$conn = mysql_connect($this -> host, $this -> user, $this -> pass);
$sql = mysql_select_db($this -> db, $conn) or die(mysql_error());
}
private function select($select, $table, $where){
$sql = "select ".$select." from ".$table." where ".$where;
$result = mysql_query($sql);
return $rdata = mysql_fetch_array($result);
}
}
$myDBObject = new DBConnect();
$myDBObject->__construct();
$myDBObject->select($select, $table, $where);
?>
if i did like this i get this error what did i do wrong in code
Fatal error: Call to private method DBConnect::select() from context '' in C:\xampp\htdocs
\Raj\cform\conn.php on line 23

Answer 1

You can use database class as mentioned below
class DBConnect
{
private $host = 'localhost';
private $user = 'user';
private $pass = 'pass';
private $db = 'mydb';
public function __construct(){
$conn = mysql_connect($this -> host, $this -> user, $this -> pass);
$sql = mysql_select_db($this -> db, $conn) or die(mysql_error());
}
// select query
private function select($select, $table, $where){
$sql = "select ".$select." from ".$table." where ".$where;
$result = mysql_query($sql);
return $rdata = mysql_fetch_array($result);
}
// update query
private function update($update, $table, $where){
// code here
}
}
When required, create object of the class and call functions as below
require 'dbConnect.php'; // assuming, you have included the database class in this file
$myDBObject = new DBConnect();
$username = mysql_real_escape_string($_POST['username']); // mysql escaping
$password = mysql_real_escape_string($_POST['password']); // mysql escaping
// select required data
$result = $myDBObject -> select('*', 'admin', 'username = "'.$username.'" and password = "'.$password.'"');
The function described in the class above are for demonstration purpose. You can include other functions in the class along with data escaping functionality.
FYI: mysql is deprecrated. Use mysqli or PDO instead. The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead

Answer 2

// Hi,
class ClassName {
static function funcName1(){
funcBody1;
}
static function funcName2(){
funcBody2;
}
}
// to use functions juste do :
ClasseName::funcName1();
ClasseName::funcName2();