<?php
class Father
{

  public $counter = 0;

  public function speak()
  {
    $this->counter++;
    echo $this->counter . PHP_EOL;
  }

  public function increase()
  {
    $this->counter++;
  }

}

$father = new Father();
$father->speak();

$child = clone $father;
echo $child->speak();

$child->increase();

echo PHP_EOL;

echo $father->counter . PHP_EOL;
//variables in child are reference to the fathers' variables
echo $child->counter . PHP_EOL;
?>
Published in: PHP
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