Adding regression test for behavior of magic methods with unset public properties

Verifies that after having unset a public property, any access to it, be it read or write, causes calls to public magic methods

Signed-off-by: Marco Pivetta <ocramius@gmail.com>

tests/classes/unset_public_properties.phpt

@@ -0,0 +1,74 @@
+--TEST--
+Un-setting public instance properties causes magic methods to be called when trying to access them from outside class scope
+--FILE--
+<?php
+
+class Test
+{
+	public $testProperty = 'property set';
+	
+	public function __get($name)
+	{
+		return '__get ' . $name;
+	}
+	
+	public function __set($name, $value)
+	{
+		$this->$name = $value;
+		echo '__set ' . $name . ' to ' . $value;
+	}
+	
+	public function __isset($name)
+	{
+		echo '__isset ' . $name;
+		return isset($this->$name);
+	}
+	
+	public function getTestProperty()
+	{
+		return $this->testProperty;
+	}
+	
+	public function setTestProperty($testProperty)
+	{
+		$this->testProperty = $testProperty;
+	}
+}
+
+$o = new Test;
+
+echo $o->testProperty;
+echo "\n";
+isset($o->testProperty);
+echo "\n";
+unset($o->testProperty);
+isset($o->testProperty);
+echo "\n";
+echo $o->testProperty;
+echo "\n";
+echo $o->getTestProperty();
+echo "\n";
+echo $o->setTestProperty('new value via setter');
+echo "\n";
+echo $o->testProperty;
+echo "\n";
+unset($o->testProperty);
+$o->testProperty = 'new value via public access';
+echo "\n";
+isset($o->testProperty);
+echo "\n";
+echo $o->testProperty;
+
+?>
+====DONE====
+--EXPECTF--
+property set
+
+__isset testProperty
+__get testProperty
+__get testProperty
+__set testProperty to new value via setter
+new value via setter
+__set testProperty to new value via public access
+
+new value via public access