3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = false; var_dump(isset($unknown)); var_dump(isset($data)); $a = "72"; var_dump( isset($a["foo"]) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rjBfB
function name:  (null)
number of ops:  15
compiled vars:  !0 = $data, !1 = $unknown, !2 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <false>
    5     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_CV                                 ~4      !1
          3        SEND_VAL                                                 ~4
          4        DO_ICALL                                                 
    6     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_CV                                 ~6      !0
          7        SEND_VAL                                                 ~6
          8        DO_ICALL                                                 
    7     9        ASSIGN                                                   !2, '72'
    8    10        INIT_FCALL                                               'var_dump'
         11        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      !2, 'foo'
         12        SEND_VAL                                                 ~9
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
151.09 ms | 1394 KiB | 15 Q