3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "72"; var_dump($a[NULL]); if(isset($a[NULL])) echo "YES"; else echo "NO";
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 10
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RV546
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '72'
    4     1        INIT_FCALL                                               'var_dump'
          2        FETCH_DIM_R                                      ~2      !0, null
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    5     5        ISSET_ISEMPTY_DIM_OBJ                         0          !0, null
          6      > JMPZ                                                     ~4, ->9
    6     7    >   ECHO                                                     'YES'
          8      > JMP                                                      ->10
    8     9    >   ECHO                                                     'NO'
         10    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
162.27 ms | 1394 KiB | 15 Q