3v4l.org

run code in 300+ PHP versions simultaneously
<?php $undef = $_POST['idontexist']; echo isset($undef);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iHLTN
function name:  (null)
number of ops:  6
compiled vars:  !0 = $undef
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   FETCH_R                      global              ~1      '_POST'
          1        FETCH_DIM_R                                      ~2      ~1, 'idontexist'
          2        ASSIGN                                                   !0, ~2
    5     3        ISSET_ISEMPTY_CV                                 ~4      !0
          4        ECHO                                                     ~4
          5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
150.28 ms | 1383 KiB | 13 Q