3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('l' => 'foo', null => 'bar'); var_dump(isset($a[null])); var_dump(isset($a['4'])); var_dump(isset($a['l'])); var_dump($a[null]); var_dump($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/8uN36
function name:  (null)
number of ops:  21
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_DIM_OBJ                         0  ~2      !0, null
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    6     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_DIM_OBJ                         0  ~4      !0, 4
          7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'var_dump'
         10        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      !0, 'l'
         11        SEND_VAL                                                 ~6
         12        DO_ICALL                                                 
    9    13        INIT_FCALL                                               'var_dump'
         14        FETCH_DIM_R                                      ~8      !0, null
         15        SEND_VAL                                                 ~8
         16        DO_ICALL                                                 
   10    17        INIT_FCALL                                               'var_dump'
         18        SEND_VAR                                                 !0
         19        DO_ICALL                                                 
         20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
165.09 ms | 1399 KiB | 15 Q