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

Generated using Vulcan Logic Dumper, using php 8.0.0


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