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<?php class XYZ {} var_dump(class_exists('xyz'), xyz::class, XyZ::class, get_class(xyz));
based on jrQaI
Output for 8.0.0alpha3 - beta1
Fatal error: Uncaught Error: Undefined constant "xyz" in /in/KlGIk:5 Stack trace: #0 {main} thrown in /in/KlGIk on line 5
Process exited with code 255.
Output for 8.0.0alpha1 - alpha2
Fatal error: Uncaught Error: Undefined constant 'xyz' in /in/KlGIk:5 Stack trace: #0 {main} thrown in /in/KlGIk on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.9
Warning: Use of undefined constant xyz - assumed 'xyz' (this will throw an Error in a future version of PHP) in /in/KlGIk on line 5 Warning: get_class() expects parameter 1 to be object, string given in /in/KlGIk on line 5 bool(true) string(3) "xyz" string(3) "XyZ" bool(false)