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<?php if(UNDEFINED_CONST == true) echo 'True!';
based on JbLE2
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 3, Position 2 = 4
Branch analysis from position: 3
Jump found. Position 1 = -2
Branch analysis from position: 4
filename:       /in/RrcK4
function name:  (null)
number of ops:  5
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_CONSTANT                                   ~0      'UNDEFINED_CONST'
         1        BOOL                                             ~1      ~0
         2      > JMPZ                                                     ~1, ->4
         3    >   ECHO                                                     'True%21'
         4    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0