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<?php $string = 'The sky is blue'; echo preg_replace_callback( '/(?:[^a-z]*\K[a-z]){4}/i', fn($m) => $m[0] ^ ' ', $string );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Mpm4A
function name:  (null)
number of ops:  9
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'The+sky+is+blue'
    4     1        INIT_FCALL                                               'preg_replace_callback'
    5     2        SEND_VAL                                                 '%2F%28%3F%3A%5B%5Ea-z%5D%2A%5CK%5Ba-z%5D%29%7B4%7D%2Fi'
    6     3        DECLARE_LAMBDA_FUNCTION                          ~2      [0]
          4        SEND_VAL                                                 ~2
    7     5        SEND_VAR                                                 !0
    4     6        DO_ICALL                                         $3      
    7     7        ECHO                                                     $3
    8     8      > 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/Mpm4A
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   RECV                                             !0      
          1        FETCH_DIM_R                                      ~1      !0, 0
          2        BW_XOR                                           ~2      ~1, '+'
          3      > RETURN                                                   ~2
          4*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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