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<?php $foo = new stClass(); $foo->foo = 'test'; var_dump(array_key_exists('foo', $foo)); var_dump(array_key_exists('bar', $foo));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/cscfc
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      'stClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    4     3        ASSIGN_OBJ                                               !0, 'foo'
          4        OP_DATA                                                  'test'
    6     5        INIT_FCALL                                               'var_dump'
          6        ARRAY_KEY_EXISTS                                 ~5      'foo', !0
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'var_dump'
         10        ARRAY_KEY_EXISTS                                 ~7      'bar', !0
         11        SEND_VAL                                                 ~7
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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