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<?php $a = array('foo' => "xyz", null => "abc"); var_dump(isset($a[null])); var_dump(isset($a['foo'])); var_dump(array_key_exists(null, $a));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/shoAB
function name:  (null)
number of ops:  14
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_DIM_OBJ                         0  ~2      !0, null
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    6     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_DIM_OBJ                         0  ~4      !0, 'foo'
          7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'var_dump'
         10        ARRAY_KEY_EXISTS                                 ~6      null, !0
         11        SEND_VAL                                                 ~6
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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