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<?php $array = ['','',2]; echo json_encode(array_keys(array_flip(array_flip($code_ids))));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/TmYD1
function name:  (null)
number of ops:  15
compiled vars:  !0 = $array, !1 = $code_ids
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'json_encode'
          2        INIT_FCALL                                               'array_keys'
          3        INIT_FCALL                                               'array_flip'
          4        INIT_FCALL                                               'array_flip'
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                         $4      
          9        SEND_VAR                                                 $4
         10        DO_ICALL                                         $5      
         11        SEND_VAR                                                 $5
         12        DO_ICALL                                         $6      
         13        ECHO                                                     $6
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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