3v4l.org

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

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
155.43 ms | 1394 KiB | 15 Q