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<?php echo strtolower(preg_replace('/((?<=[a-z])(?=[A-Z]))/', '_', 'AbcDefGhijk'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/hIQUW
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                                   'strtolower'
          1        FRAMELESS_ICALL_3                preg_replace        ~0      '%2F%28%28%3F%3C%3D%5Ba-z%5D%29%28%3F%3D%5BA-Z%5D%29%29%2F', '_'
          2        OP_DATA                                                      'AbcDefGhijk'
          3        SEND_VAL                                                     ~0
          4        DO_ICALL                                             $1      
          5        ECHO                                                         $1
          6      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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