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<?php $a = "4d9"; $a++; echo $a; echo ' - '; $a++; echo $a;
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/a3n6B
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, '4d9'
   3     1        POST_INC                                         ~2      !0
         2        FREE                                                     ~2
   4     3        ECHO                                                     !0
   6     4        ECHO                                                     '+-+'
   7     5        POST_INC                                         ~3      !0
         6        FREE                                                     ~3
   8     7        ECHO                                                     !0
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0