Description:
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URL I'm referring to is http://www.php.net/manual/en/language.oop5.basic.php#language.oop5.basic.new
1) Documentation says that "To create an instance of a class, a new object must be created and assigned to a variable", though it doesn't really have to be assigned to a variable.
2) There is an example with storing class name in a variable and using this variable to create an object, i.e., $instance = new $className(), though this does not always work as expected with namespaced classes (I'm not sure if this is a "documentation problem" or a bug). It would be worth noting that namespaced classes need a full name to be stored in variable, even if it is being used the same namespaced. See a test script for an example.

Test script:
---------------
<?php
	namespace MyNamespace {
		class MyClass {
			function __construct() {
				echo __METHOD__, "\n";
			}
		}
		$obj = new MyClass(); // works
		$obj = new \MyNamespace\MyClass(); // works
		$obj = new MyNamespace\MyClass(); // does not work, resolves as MyNamespace\MyNamespace\MyClass
		$className = '\\MyNamespace\\MyClass';
		$obj = new $className(); // works, as $className includues namespace
		$className = 'MyNamespace\\MyClass';
		$obj = new $className(); // still works, as it resolves as <global namespace>\MyNamespace\MyClass
		$className = 'MyClass';
		$obj = new $className(); // does not work
	}


Expected result:
----------------
MyNamespace\MyClass::__construct
MyNamespace\MyClass::__construct
PHP Fatal error
MyNamespace\MyClass::__construct
MyNamespace\MyClass::__construct
PHP Fatal error


Actual result:
--------------
MyNamespace\MyClass::__construct
MyNamespace\MyClass::__construct
PHP Fatal error
MyNamespace\MyClass::__construct
PHP Fatal error
MyNamespace\MyClass::__construct