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<?php $str = 'Hello_world!'; $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/-'; $max = strlen($chars) - 1; echo preg_replace_callback( '/.\K/', fn() => $chars[rand(0, $max)], $str );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Mu32m
function name:  (null)
number of ops:  15
compiled vars:  !0 = $str, !1 = $chars, !2 = $max
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Hello_world%21'
    4     1        ASSIGN                                                   !1, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789%2F-'
    5     2        STRLEN                                           ~5      !1
          3        SUB                                              ~6      ~5, 1
          4        ASSIGN                                                   !2, ~6
    7     5        INIT_FCALL                                               'preg_replace_callback'
    8     6        SEND_VAL                                                 '%2F.%5CK%2F'
    9     7        DECLARE_LAMBDA_FUNCTION                          ~8      [0]
          8        BIND_LEXICAL                                             ~8, !1
          9        BIND_LEXICAL                                             ~8, !2
         10        SEND_VAL                                                 ~8
   10    11        SEND_VAR                                                 !0
    7    12        DO_ICALL                                         $9      
   10    13        ECHO                                                     $9
   11    14      > RETURN                                                   1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Mu32m
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $chars, !1 = $max
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   BIND_STATIC                                              !0
          1        BIND_STATIC                                              !1
          2        INIT_FCALL                                               'rand'
          3        SEND_VAL                                                 0
          4        SEND_VAR                                                 !1
          5        DO_ICALL                                         $2      
          6        FETCH_DIM_R                                      ~3      !0, $2
          7      > RETURN                                                   ~3
          8*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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