3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 6; var_dump($a['foo']); var_dump($a['foo'] !== null); echo "\n---\n"; $a = []; var_dump($a['foo']); var_dump($a['foo'] !== null);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fsbh2
function name:  (null)
number of ops:  22
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 6
    4     1        INIT_FCALL                                               'var_dump'
          2        FETCH_DIM_R                                      ~2      !0, 'foo'
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        FETCH_DIM_R                                      ~4      !0, 'foo'
          7        TYPE_CHECK                                  1020  ~5      ~4
          8        SEND_VAL                                                 ~5
          9        DO_ICALL                                                 
    7    10        ECHO                                                     '%0A---%0A'
    9    11        ASSIGN                                                   !0, <array>
   10    12        INIT_FCALL                                               'var_dump'
         13        FETCH_DIM_R                                      ~8      !0, 'foo'
         14        SEND_VAL                                                 ~8
         15        DO_ICALL                                                 
   11    16        INIT_FCALL                                               'var_dump'
         17        FETCH_DIM_R                                      ~10     !0, 'foo'
         18        TYPE_CHECK                                  1020  ~11     ~10
         19        SEND_VAL                                                 ~11
         20        DO_ICALL                                                 
         21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
166.77 ms | 1395 KiB | 15 Q