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<?php $string = 'слово слово слово слово'; echo preg_replace("/\w+\K/u", '*', $string);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Md71M
function name:  (null)
number of ops:  8
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%D1%81%D0%BB%D0%BE%D0%B2%D0%BE+%D1%81%D0%BB%D0%BE%D0%B2%D0%BE+%D1%81%D0%BB%D0%BE%D0%B2%D0%BE+%D1%81%D0%BB%D0%BE%D0%B2%D0%BE'
    5     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%5Cw%2B%5CK%2Fu'
          3        SEND_VAL                                                 '%2A'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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