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<?php var_dump(preg_replace('#(\d{3})(\d{3})(\d{4})#', '$1-$2-$3', '0123456789'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZfPKN
function name:  (null)
number of ops:  6
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                                   'var_dump'
          1        FRAMELESS_ICALL_3                preg_replace        ~0      '%23%28%5Cd%7B3%7D%29%28%5Cd%7B3%7D%29%28%5Cd%7B4%7D%29%23', '%241-%242-%243'
          2        OP_DATA                                                      '0123456789'
          3        SEND_VAL                                                     ~0
          4        DO_ICALL                                                     
          5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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