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<?php $foo = array( "a" => 1, "b" => 2, "c" => 3, "d" => 4, ); $foo = ['c' => $foo['c']] + $foo; var_export($foo); echo "\n---\n"; $bar = array( "a" => 1, "b" => 2, "d" => 4, ); if (array_key_exists('c', $bar)) { $bar = ['c' => $bar['c']] + $bar; } var_export($bar);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 12, Position 2 = 16
Branch analysis from position: 12
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 16
filename:       /in/r92vS
function name:  (null)
number of ops:  20
compiled vars:  !0 = $foo, !1 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    9     1        FETCH_DIM_R                                      ~3      !0, 'c'
          2        INIT_ARRAY                                       ~4      ~3, 'c'
          3        ADD                                              ~5      ~4, !0
          4        ASSIGN                                                   !0, ~5
   10     5        INIT_FCALL                                               'var_export'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
   12     8        ECHO                                                     '%0A---%0A'
   14     9        ASSIGN                                                   !1, <array>
   19    10        ARRAY_KEY_EXISTS                                         'c', !1
         11      > JMPZ                                                     ~9, ->16
   20    12    >   FETCH_DIM_R                                      ~10     !1, 'c'
         13        INIT_ARRAY                                       ~11     ~10, 'c'
         14        ADD                                              ~12     ~11, !1
         15        ASSIGN                                                   !1, ~12
   22    16    >   INIT_FCALL                                               'var_export'
         17        SEND_VAR                                                 !1
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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