3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = ''; $var2 = null; $var3 = ""; echo isset($var); echo isset($var2); echo isset($var3);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/XlIlp
function name:  (null)
number of ops:  10
compiled vars:  !0 = $var, !1 = $var2, !2 = $var3
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, ''
    4     1        ASSIGN                                                   !1, null
    5     2        ASSIGN                                                   !2, ''
    7     3        ISSET_ISEMPTY_CV                                 ~6      !0
          4        ECHO                                                     ~6
    8     5        ISSET_ISEMPTY_CV                                 ~7      !1
          6        ECHO                                                     ~7
    9     7        ISSET_ISEMPTY_CV                                 ~8      !2
          8        ECHO                                                     ~8
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
148.2 ms | 1392 KiB | 13 Q