3v4l.org

run code in 300+ PHP versions simultaneously
<?php $obj = new stdClass(); $obj->bar = "xyz"; $data = array("foo" => "bar"); $key = "foo"; // echo $obj->${data[$key]}; syntax error echo $obj->{$data[$key]}; $member = $data[$key]; echo $obj->${'member'}; echo $obj->{$member}; echo ${'data'}[$key]; // of course, this works echo ${data[$key]}; // of course, this works echo "\n${data[$key]}\n"; // of course, this works echo "{${'data'}[$key]}"; // of course, this works echo "{$data[$key]}";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HYGZc
function name:  (null)
number of ops:  34
compiled vars:  !0 = $obj, !1 = $data, !2 = $key, !3 = $member
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $4      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $4
    4     3        ASSIGN_OBJ                                               !0, 'bar'
          4        OP_DATA                                                  'xyz'
    5     5        ASSIGN                                                   !1, <array>
    6     6        ASSIGN                                                   !2, 'foo'
    8     7        FETCH_DIM_R                                      ~10     !1, !2
          8        FETCH_OBJ_R                                      ~11     !0, ~10
          9        ECHO                                                     ~11
    9    10        FETCH_DIM_R                                      ~12     !1, !2
         11        ASSIGN                                                   !3, ~12
   10    12        FETCH_OBJ_R                                      ~14     !0, !3
         13        ECHO                                                     ~14
   11    14        FETCH_OBJ_R                                      ~15     !0, !3
         15        ECHO                                                     ~15
   13    16        FETCH_DIM_R                                      ~16     !1, !2
         17        ECHO                                                     ~16
   15    18        FETCH_CONSTANT                                   ~17     'data'
         19        FETCH_DIM_R                                      ~18     ~17, !2
         20        FETCH_R                      local               ~19     ~18
         21        ECHO                                                     ~19
   17    22        ROPE_INIT                                     3  ~22     '%0A'
         23        FETCH_DIM_R                                      ~20     !1, !2
         24        ROPE_ADD                                      1  ~22     ~22, ~20
         25        ROPE_END                                      2  ~21     ~22, '%0A'
         26        ECHO                                                     ~21
   19    27        FETCH_DIM_R                                      ~24     !1, !2
         28        CAST                                          6  ~25     ~24
         29        ECHO                                                     ~25
   20    30        FETCH_DIM_R                                      ~26     !1, !2
         31        CAST                                          6  ~27     ~26
         32        ECHO                                                     ~27
         33      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
163.62 ms | 1395 KiB | 13 Q