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<?php $str = 'a\\\\,b,c\\,d'; var_dump(preg_split('/(?<!(?<!\\\\)\\\\),/', $str));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/AtJWb
function name:  (null)
number of ops:  9
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                       !0, 'a%5C%5C%2Cb%2Cc%5C%2Cd'
    3     1        INIT_FCALL                                                   'var_dump'
          2        INIT_FCALL                                                   'preg_split'
          3        SEND_VAL                                                     '%2F%28%3F%3C%21%28%3F%3C%21%5C%5C%29%5C%5C%29%2C%2F'
          4        SEND_VAR                                                     !0
          5        DO_ICALL                                             $2      
          6        SEND_VAR                                                     $2
          7        DO_ICALL                                                     
          8      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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