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<?php $arr = array(); $arr[0] = &$arr; var_dump(json_encode($arr)); var_dump(json_last_error());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/nd4C2
function name:  (null)
number of ops:  15
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        FETCH_DIM_W                                      $2      !0, 0
          2        ASSIGN_REF                                               $2, !0
    5     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'json_encode'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'json_last_error'
         11        DO_ICALL                                         $6      
         12        SEND_VAR                                                 $6
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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