3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = false; $value=null; var_dump(isset($unknown)); var_dump(isset($data)); var_dump(isset($value)); $a = "72"; var_dump( isset($a["foo"]) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/DWGMQ
function name:  (null)
number of ops:  20
compiled vars:  !0 = $data, !1 = $value, !2 = $unknown, !3 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <false>
    4     1        ASSIGN                                                   !1, null
    6     2        INIT_FCALL                                               'var_dump'
          3        ISSET_ISEMPTY_CV                                 ~6      !2
          4        SEND_VAL                                                 ~6
          5        DO_ICALL                                                 
    7     6        INIT_FCALL                                               'var_dump'
          7        ISSET_ISEMPTY_CV                                 ~8      !0
          8        SEND_VAL                                                 ~8
          9        DO_ICALL                                                 
    8    10        INIT_FCALL                                               'var_dump'
         11        ISSET_ISEMPTY_CV                                 ~10     !1
         12        SEND_VAL                                                 ~10
         13        DO_ICALL                                                 
    9    14        ASSIGN                                                   !3, '72'
   10    15        INIT_FCALL                                               'var_dump'
         16        ISSET_ISEMPTY_DIM_OBJ                         0  ~13     !3, 'foo'
         17        SEND_VAL                                                 ~13
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
154.63 ms | 1395 KiB | 15 Q