3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = null; $name = 'foo'; var_dump(array($$name)); var_dump(array(&$$name));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RHUZG
function name:  (null)
number of ops:  13
compiled vars:  !0 = $foo, !1 = $name
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, null
    3     1        ASSIGN                                                   !1, 'foo'
    4     2        INIT_FCALL                                               'var_dump'
          3        FETCH_R                      local               ~4      !1
          4        INIT_ARRAY                                       ~5      ~4
          5        SEND_VAL                                                 ~5
          6        DO_ICALL                                                 
    5     7        INIT_FCALL                                               'var_dump'
          8        FETCH_W                      local               $7      !1
          9        INIT_ARRAY                                       ~8      $7
         10        SEND_VAL                                                 ~8
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
153.66 ms | 1394 KiB | 15 Q