3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(); if (is_null($a)) { echo 'a'; } else { echo 'b'; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 5
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QpGoV
function name:  (null)
number of ops:  7
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        TYPE_CHECK                                    2          !0
          2      > JMPZ                                                     ~2, ->5
    6     3    >   ECHO                                                     'a'
          4      > JMP                                                      ->6
   10     5    >   ECHO                                                     'b'
   11     6    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
161.51 ms | 1392 KiB | 13 Q