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<?php $list = '1,2,3,4'; preg_match_all('/^\d+|\G(?!^)(,?\d+)\K/', $list, $matches); print_r(array_map('array_filter', $matches));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/26spM
function name:  (null)
number of ops:  14
compiled vars:  !0 = $list, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '1%2C2%2C3%2C4'
    4     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%2F%5E%5Cd%2B%7C%5CG%28%3F%21%5E%29%28%2C%3F%5Cd%2B%29%5CK%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    5     6        INIT_FCALL                                               'print_r'
          7        INIT_FCALL                                               'array_map'
          8        SEND_VAL                                                 'array_filter'
          9        SEND_VAR                                                 !1
         10        DO_ICALL                                         $4      
         11        SEND_VAR                                                 $4
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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