Description:
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While it's no problem to change the visibility of a constructor (limit the visibility) when using the old way of declaring a constructor (function with the same name as the class), it's not possible to lower the visibility in a hierarchy where the constructors are named after the new standard : __construct() .
The engine have to check whether the name is __construct() (what about __destruct()? ), and not to complain in this case that the visibility is lowered.

The first example emits a fatal error. The second is perfectly valid.

Reproduce code:
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php -r 'class a{public function __construct() {}} class b extends a {private function __construct(){}}'

php -r 'class a{public function a() {}} class b extends a {private function b(){}}'

Actual result:
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PHP Fatal error:  Access level to b::__construct() must be public (as in class a) in Command line code on line 1