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<?php class First extends Second{} class Second extends Third{} class Fourth {} class Third{}
based on tInfU
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/FVv7A
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_CLASS                                   0  :0      'Second'
         1        DECLARE_INHERITED_CLASS                          $1      'first', $0
   4     2        FETCH_CLASS                                   0  :2      'Third'
         3        DECLARE_INHERITED_CLASS                          $3      'second', $2
   5     4        NOP                                                      
   6     5        NOP                                                      
         6      > RETURN                                                   1

Class First: [no user functions]
Class Second: [no user functions]
Class Fourth: [no user functions]
Class Third: [no user functions]

Generated using Vulcan Logic Dumper, using php 7.2.0