Online PHP editor | output for TnQRo

<?php class String { private $_stringValue; public function __construct($stringValue = '') { $this->_stringValue = ''.$stringValue; } public function __toString() { return $this->_stringValue; } public function getLength() { return mb_strlen($this->_stringValue); } } abstract class AbsTestClass { protected $_privateProperty = 'World'; public function __construct($name) { $this->_privateProperty = $name; } public function getName() { return $this->_privateProperty; } public function getWelcomingMessage() { return 'Hello '.$this->getName().'!'; } abstract public function setName(String $name); } class TestClass extends AbsTestClass { public function setName(String $name) { $this->_privateProperty = $name->__toString(); } } $message = new TestClass('World'); echo $message->getWelcomingMessage()."\n"; $message->setName(new String('Jahala')); echo $message->getWelcomingMessage()."\n";