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<?php $str = 'This is the string number 123-45-6789-0 which contains 12-34567.'; echo preg_replace_callback('~\d+(?:-\d+)+~', function($m) { return implode('-', array_reverse(explode('-', $m[0]))); } ,$str);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/33tjk
function name:  (null)
number of ops:  9
compiled vars:  !0 = $str
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'This+is+the+string+number+123-45-6789-0+which+contains+12-34567.'
   4     1        INIT_FCALL                                               'preg_replace_callback'
         2        SEND_VAL                                                 '%7E%5Cd%2B%28%3F%3A-%5Cd%2B%29%2B%7E'
         3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2F33tjk0x7f1bc887a0cc'
   5     4        SEND_VAL                                                 ~2
   6     5        SEND_VAR                                                 !0
         6        DO_ICALL                                         $3      
         7        ECHO                                                     $3
         8      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2F33tjk0x7f1bc887a0cc:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/33tjk
function name:  {closure}
number of ops:  15
compiled vars:  !0 = $m
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   RECV                                             !0      
   5     1        INIT_FCALL                                               'implode'
         2        SEND_VAL                                                 '-'
         3        INIT_FCALL                                               'array_reverse'
         4        INIT_FCALL                                               'explode'
         5        SEND_VAL                                                 '-'
         6        FETCH_DIM_R                                      ~1      !0, 0
         7        SEND_VAL                                                 ~1
         8        DO_ICALL                                         $2      
         9        SEND_VAR                                                 $2
        10        DO_ICALL                                         $3      
        11        SEND_VAR                                                 $3
        12        DO_ICALL                                         $4      
        13      > RETURN                                                   $4
        14*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2F33tjk0x7f1bc887a0cc

Generated using Vulcan Logic Dumper, using php 8.0.0


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