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<?php $foo = new ArrayObject(); $bar = new ArrayObject(); $bar[] = null; $foo[] = $bar; var_dump(json_encode($foo));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OZJpe
function name:  (null)
number of ops:  17
compiled vars:  !0 = $foo, !1 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $2      'ArrayObject'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
    4     3        NEW                                              $5      'ArrayObject'
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !1, $5
    5     6        ASSIGN_DIM                                               !1
          7        OP_DATA                                                  null
    6     8        ASSIGN_DIM                                               !0
          9        OP_DATA                                                  !1
    7    10        INIT_FCALL                                               'var_dump'
         11        INIT_FCALL                                               'json_encode'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                         $10     
         14        SEND_VAR                                                 $10
         15        DO_ICALL                                                 
         16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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