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<?php $a=['foo'=>123]; define('foo', 'foo'); echo "lalala {$a[foo]} bar";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/1etv6
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'define'
          2        SEND_VAL                                                 'foo'
          3        SEND_VAL                                                 'foo'
          4        DO_ICALL                                                 
    7     5        ROPE_INIT                                     3  ~6      'lalala+'
          6        FETCH_CONSTANT                                   ~3      'foo'
          7        FETCH_DIM_R                                      ~4      !0, ~3
          8        ROPE_ADD                                      1  ~6      ~6, ~4
          9        ROPE_END                                      2  ~5      ~6, '+bar'
         10        ECHO                                                     ~5
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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