How to access global php variable inside namespaces?

<?phpnamespace foo;$a = new \\stdClass;function test(\\ArrayObject $typehintexample = null) {}$a = \\DirectoryIterator::CURRENT_AS_FILEINFO;// extending an internal or global classclass MyException extends \\Exception {}?>

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use global before start using it

global $global;

then use it normally

$global++;