how to print text which is stored in object

oop
how to print text which is stored in object
<?php
class Example{	declared class, declared property and write function to display,
public $text = 'welcome to telug computer worlds';
public function display (){
echo '<h2>' .$this -> text. '</h2>';
}
}
$ex = new Example;	declared object
echo $ex -> text;	load that text to ex and print
echo $ex -> display();	load that display output to ex and print that
?>
<?php
class Example{
public $text = 'welcome to telug computer worlds';
public function display (){
echo '<h2>' .$this -> text. '</h2>';
}
}
class AnExample extends Example{	without writng whole code from previous class, simply write extend,  using this we can use the variables
}
$ae = new AnExample;
echo $ae -> text;
echo $ae -> display();
?>
how to print text which is stored in object
<?php
class Example{
public $text = 'welcome to telug computer worlds';
public function display (){
echo '<h2>' .$this -> text. '</h2>';
}
}
$ex = new Example;
echo $ex -> text;
echo $ex -> display();
?>
how to use other class
<?php
class Example{
public $text = 'welcome to telug computer worlds';
public function display (){
echo '<h2>' .$this -> text. '</h2>';
}
}
class AnExample extends Example{
public $string = 'telugu computer world';
public function displayString (){
return '<h1> .$this -> string .'</h1>';
}
}
$ae = new AnExample;
$ae -> displaystring();
?>
class public public function new class extends class public public function echo echo class public public class extends public public function return new
how to concatenate variable and html how to use other class