Description:
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When all 3 classes are in one file, everything works fine, and Test Script A (main) gives expected output.

However, when you separate the classes into 3 files and using autoloading (PSR-4 via composer, but probably doesn't matter what standard we use), this fails...

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Also, one more interesting fact is if you try Test Script B (on the side), It seems to work as expected, though it should not make any difference based on my class declaration.

Test script:
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Class declaration:
http://beamstyle.com.hk/download/script.txt

Test Script A (Main):
\Namespace2\B::test() . '<br>';
\Namespace2\C::test() . '<br>';
\Namespace2\B::test() . '<br>';
\Namespace2\C::test() . '<br>';

Test Script B (On the side):
\Namespace2\C::test() . '<br>';
\Namespace2\B::test() . '<br>';
\Namespace2\C::test() . '<br>';
\Namespace2\B::test() . '<br>';


Expected result:
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$var===null for the class: Namespace2\B
$var===null for the class: Namespace2\C
$var!==null for the class: Namespace2\B
$var!==null for the class: Namespace2\C

Actual result:
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$var===null for the class: Namespace2\B
$var!==null for the class: Namespace2\C
$var!==null for the class: Namespace2\B
$var!==null for the class: Namespace2\C