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<?php interface IFace { const FOO = __CLASS__; } class ClassA implements IFace { // PHP Fatal error: Cannot inherit previously-inherited or override constant FOO from interface //const FOO = __CLASS__; } class ClassB extends ClassA { // works const FOO = __CLASS__; } echo ClassB::FOO; 
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CWuQB
function name:  (null)
number of ops:  5
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   DECLARE_CLASS                                            'classa'
   14     1        DECLARE_CLASS                                            'classb', 'classa'
   20     2        FETCH_CLASS_CONSTANT                             ~0      'ClassB', 'FOO'
          3        ECHO                                                     ~0
   21     4      > RETURN                                                   1

Class IFace: [no user functions]
Class ClassA: [no user functions]
Class ClassB: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
266.18 ms | 1005 KiB | 13 Q