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<!DOCTYPE html>
<html>
<body>
<?php
class MyClass {
  private $number = 0;
  public function add1() {
    $this->number++;
 }
  public function getNumber() {
    return $this->number;
  }
}
$obj = new MyClass();
$obj->add1();
echo "The number is " . $obj->getNumber();
?>
</body>
</html>
The number is 1