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<?php $str = '11131221133112'; var_export( preg_replace( '/(\d)\1*\K(?!$)/', ' ', $str ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/giArN
function name:  (null)
number of ops:  7
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '11131221133112'
    5     1        INIT_FCALL                                                   'var_export'
    6     2        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%28%5Cd%29%5C1%2A%5CK%28%3F%21%24%29%2F', '+'
    9     3        OP_DATA                                                      !0
          4        SEND_VAL                                                     ~2
    5     5        DO_ICALL                                                     
   11     6      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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