Description:
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The manual for ReflectionClass::getConstructor():
http://www.php.net/manual/en/reflectionclass.getconstructor.php

Documents ReflectionMethod as the only possible return value.

However, as demonstrated in the test script below, this method can return NULL 
when the class has no constructor.

The documentation should be changed to:

Return Values
A ReflectionMethod object reflecting the class' constructor, or NULL if the class 
has no constructor.

Test script:
---------------
class C {}
$r = new ReflectionClass('C');
var_export($r->getConstructor()); // NULL