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<?php preg_replace_callback('/a(\w)|b(\w)/','var_dump','axby');
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/e4djh
function name:  (null)
number of ops:  6
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'preg_replace_callback'
         1        SEND_VAL                                                 '%2Fa%28%5Cw%29%7Cb%28%5Cw%29%2F'
         2        SEND_VAL                                                 'var_dump'
         3        SEND_VAL                                                 'axby'
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0