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<?php namespace Test\David; interface Bar {}; class Foo implements Bar {}; var_dump(class_implements(''));
based on SQMRX
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.21.3, 7.1.0 - 7.3.0beta1
Warning: class_implements(): Class does not exist and could not be loaded in /in/Xetok on line 8 bool(false)
Output for hhvm-3.22.0
Warning: class_implements(): Class does not exist and could not be loaded in /in/Xetok on line -1 bool(false)