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<?php $a = "1234567890"; var_dump($a["10"], isset($a["10"])); // false; 10進数の10として認識されている $a .= "a"; var_dump($a["10"], isset($a["10"])); // true
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/NQvXb
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '1234567890'
    4     1        INIT_FCALL                                               'var_dump'
          2        FETCH_DIM_R                                      ~2      !0, 10
          3        SEND_VAL                                                 ~2
          4        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      !0, 10
          5        SEND_VAL                                                 ~3
          6        DO_ICALL                                                 
    6     7        ASSIGN_OP                                     8          !0, 'a'
    7     8        INIT_FCALL                                               'var_dump'
          9        FETCH_DIM_R                                      ~6      !0, 10
         10        SEND_VAL                                                 ~6
         11        ISSET_ISEMPTY_DIM_OBJ                         0  ~7      !0, 10
         12        SEND_VAL                                                 ~7
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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