3v4l.org

run code in 300+ PHP versions simultaneously
<?php /*function ref(&$a) {} function val($a) {}*/ $b = []; $a = $b['a']['b']; $a =& $b['a']['b']; ref($b['a']['b']); val($b['a']['b']);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WcD4K
function name:  (null)
number of ops:  20
compiled vars:  !0 = $b, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   ASSIGN                                                   !0, <array>
    7     1        FETCH_DIM_R                                      ~3      !0, 'a'
          2        FETCH_DIM_R                                      ~4      ~3, 'b'
          3        ASSIGN                                                   !1, ~4
    8     4        FETCH_DIM_W                                      $6      !0, 'a'
          5        FETCH_DIM_W                                      $7      $6, 'b'
          6        ASSIGN_REF                                               !1, $7
    9     7        INIT_FCALL_BY_NAME                                       'ref'
          8        CHECK_FUNC_ARG                                           
          9        FETCH_DIM_FUNC_ARG                               $9      !0, 'a'
         10        FETCH_DIM_FUNC_ARG                               $10     $9, 'b'
         11        SEND_FUNC_ARG                                            $10
         12        DO_FCALL                                      0          
   10    13        INIT_FCALL_BY_NAME                                       'val'
         14        CHECK_FUNC_ARG                                           
         15        FETCH_DIM_FUNC_ARG                               $12     !0, 'a'
         16        FETCH_DIM_FUNC_ARG                               $13     $12, 'b'
         17        SEND_FUNC_ARG                                            $13
         18        DO_FCALL                                      0          
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
163.69 ms | 1393 KiB | 13 Q