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<?php $foo = new ArrayObject(); $foo[] = $foo; var_dump(json_encode($foo, JSON_PARTIAL_OUTPUT_ON_ERROR));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/sBmte
function name:  (null)
number of ops:  14
compiled vars:  !0 = $foo
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'ArrayObject'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    4     3        QM_ASSIGN                                        ~5      !0
          4        ASSIGN_DIM                                               !0
          5        OP_DATA                                                  ~5
    5     6        INIT_FCALL                                               'var_dump'
          7        INIT_FCALL                                               'json_encode'
          8        SEND_VAR                                                 !0
          9        SEND_VAL                                                 512
         10        DO_ICALL                                         $6      
         11        SEND_VAR                                                 $6
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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