closure_bind.php

<?php

class TestClass {
  private $id;

  public function __construct($id) {
    $this->id = $id;
  }

  public function getPublic() {
    return "public {$this->id}";
  }

  protected function getProtected() {
    return "protected {$this->id}";
  }

  private function getPrivate() {
    return "private {$this->id}";
  }

  public function getClosure() {
    return function() {
      echo
        $this->getPublic(), "\n",
        $this->getProtected(), "\n",
        $this->getPrivate(), "\n";
    };
  }
}


$inst1 = new TestClass(1);
$inst2 = new TestClass(2);

$c1 = $inst1->getClosure();
$c1();
$c2 = $c1->bindTo($inst2);
$c2();

// public 1
// protected 1
// private 1
// public 2
// protected 2
// private 2

class TestClassDecorator extends TestClass {
  public function getPublic() {
    return "\t<value>" . parent::getPublic() . "</value>";
  }

  public function getProtected() {
    return "\t<value>" . parent::getProtected() . "</value>";
  }

  public function getPrivate() {
    return "\t<value>" . parent::getPrivate() . "</value>";
  }

  public function getClosure() {
    return function() {
      $c = parent::getClosure();
      echo "<decorated>", "\n";
      $c();
      echo "</decorated>", "\n";
    };
  }
}


$inst1 = new TestClassDecorator(1);
$inst2 = new TestClass(2);

$c1 = $inst1->getClosure();
$c1();
$c2 = $c1->bindTo($inst2);
$c2();

// <decorated>
//         <value>public 1</value>
//         <value>protected 1</value>
// private 1
// </decorated>
// <decorated>
// public 2
// protected 2
// private 2
// </decorated>