3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'vskutku?'; echo (!isset($a['foo']) || empty($a['foo'])) ? 'true ' : 'false'; echo empty($a['foo']) ? 'true ' : 'false';
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 47) Position 1 = 4, Position 2 = 6
Branch analysis from position: 4
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 10
Branch analysis from position: 10
2 jumps found. (Code = 43) Position 1 = 13, Position 2 = 15
Branch analysis from position: 13
1 jumps found. (Code = 42) Position 1 = 16
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
2 jumps found. (Code = 43) Position 1 = 13, Position 2 = 15
Branch analysis from position: 13
Branch analysis from position: 15
Branch analysis from position: 6
filename:       /in/bogo7
function name:  (null)
number of ops:  18
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'vskutku%3F'
          1        ISSET_ISEMPTY_DIM_OBJ                         0  ~2      !0, 'foo'
          2        BOOL_NOT                                         ~3      ~2
          3      > JMPNZ_EX                                         ~3      ~3, ->6
          4    >   ISSET_ISEMPTY_DIM_OBJ                         1  ~4      !0, 'foo'
          5        BOOL                                             ~3      ~4
          6    > > JMPZ                                                     ~3, ->9
          7    >   QM_ASSIGN                                        ~5      'true+'
          8      > JMP                                                      ->10
          9    >   QM_ASSIGN                                        ~5      'false'
         10    >   ECHO                                                     ~5
         11        ISSET_ISEMPTY_DIM_OBJ                         1          !0, 'foo'
         12      > JMPZ                                                     ~6, ->15
         13    >   QM_ASSIGN                                        ~7      'true+'
         14      > JMP                                                      ->16
         15    >   QM_ASSIGN                                        ~7      'false'
         16    >   ECHO                                                     ~7
         17      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
163.43 ms | 1394 KiB | 13 Q