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run code in 200+ php & hhvm versions
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<?php class Foo { private $test = 'sd'; } $foo = new Foo; var_dump( json_decode(json_encode($foo), true));
based on iqGfX
Output for 5.6.0 - 5.6.38, hhvm-3.15.4, 7.0.0 - 7.3.1
array(0) { }