3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = NULL; $b = NULL; $c = NULL; var_dump(isset($a)); var_dump(isset($b)); var_dump(empty($c)); var_dump(empty($d)); var_dump($d);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/m9i8l
function name:  (null)
number of ops:  23
compiled vars:  !0 = $a, !1 = $b, !2 = $c, !3 = $d
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        ASSIGN                                                   !1, null
    5     2        ASSIGN                                                   !2, null
    7     3        INIT_FCALL                                               'var_dump'
          4        ISSET_ISEMPTY_CV                                 ~7      !0
          5        SEND_VAL                                                 ~7
          6        DO_ICALL                                                 
    8     7        INIT_FCALL                                               'var_dump'
          8        ISSET_ISEMPTY_CV                                 ~9      !1
          9        SEND_VAL                                                 ~9
         10        DO_ICALL                                                 
    9    11        INIT_FCALL                                               'var_dump'
         12        ISSET_ISEMPTY_CV                                 ~11     !2
         13        SEND_VAL                                                 ~11
         14        DO_ICALL                                                 
   10    15        INIT_FCALL                                               'var_dump'
         16        ISSET_ISEMPTY_CV                                 ~13     !3
         17        SEND_VAL                                                 ~13
         18        DO_ICALL                                                 
   11    19        INIT_FCALL                                               'var_dump'
         20        SEND_VAR                                                 !3
         21        DO_ICALL                                                 
         22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
181.88 ms | 1395 KiB | 15 Q