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<?php $array = array( 'Foo' => NULL ); for( $i = 0; $i <= 10000; $i += 1 ) { var_dump( array_key_exists( 'Foo', $array ) ); }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 8
Branch analysis from position: 8
2 jumps found. (Code = 44) Position 1 = 10, Position 2 = 3
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 3
2 jumps found. (Code = 44) Position 1 = 10, Position 2 = 3
Branch analysis from position: 10
Branch analysis from position: 3
filename:       /in/YEMaA
function name:  (null)
number of ops:  11
compiled vars:  !0 = $array, !1 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        ASSIGN                                                   !1, 0
          2      > JMP                                                      ->8
    7     3    >   INIT_FCALL                                               'var_dump'
          4        ARRAY_KEY_EXISTS                                 ~4      'Foo', !0
          5        SEND_VAL                                                 ~4
          6        DO_ICALL                                                 
    5     7        ASSIGN_OP                                     1          !1, 1
          8    >   IS_SMALLER_OR_EQUAL                                      !1, 10000
          9      > JMPNZ                                                    ~7, ->3
    8    10    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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