barvalueaMemberVar Member Variable 

<pre>
$obj = (object) array('foo' => 'bar', 'property' => 'value');
echo $obj->foo; // prints 'bar'
echo $obj->property; // prints 'value'
---
class Foo {
public $aMemberVar = 'aMemberVar Member Variable';
public $aFuncName = 'aMemberFunc';
function aMemberFunc() {
 print 'Inside `aMemberFunc()`';
}
}
$foo = new Foo;
$element = 'aMemberVar';
print $foo->$element; // prints "aMemberVar Member Variable"
---
http://php.net/manual/en/language.oop5.php
http://thaiall.com/php5
---
</pre>