3v4l.org

run code in 300+ PHP versions simultaneously
<?php session_start(); class Foo {} $foo = new Foo(); $_SESSION['foo'] = 'foo'; var_dump(isset($$_SESSION['foo']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YmLm6
function name:  (null)
number of ops:  15
compiled vars:  !0 = $foo
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'session_start'
          1        DO_ICALL                                                 
    7     2        NEW                                              $2      'Foo'
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !0, $2
    9     5        FETCH_W                      global              $5      '_SESSION'
          6        ASSIGN_DIM                                               $5, 'foo'
          7        OP_DATA                                                  'foo'
   11     8        INIT_FCALL                                               'var_dump'
          9        FETCH_R                      global              ~7      '_SESSION'
         10        FETCH_IS                                         ~8      ~7
         11        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      ~8, 'foo'
         12        SEND_VAL                                                 ~9
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Class Foo: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
195.51 ms | 941 KiB | 18 Q