3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array( 'a' => array( 'a' => 1, ), ); var_dump(isset($a['a']['a'])); var_dump(isset($a['a']['b'])); var_dump(isset($a['b']['a'])); var_dump(isset($a['b']['b']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vk8sp
function name:  (null)
number of ops:  22
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    9     1        INIT_FCALL                                               'var_dump'
          2        FETCH_DIM_IS                                     ~2      !0, 'a'
          3        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      ~2, 'a'
          4        SEND_VAL                                                 ~3
          5        DO_ICALL                                                 
   10     6        INIT_FCALL                                               'var_dump'
          7        FETCH_DIM_IS                                     ~5      !0, 'a'
          8        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      ~5, 'b'
          9        SEND_VAL                                                 ~6
         10        DO_ICALL                                                 
   11    11        INIT_FCALL                                               'var_dump'
         12        FETCH_DIM_IS                                     ~8      !0, 'b'
         13        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      ~8, 'a'
         14        SEND_VAL                                                 ~9
         15        DO_ICALL                                                 
   12    16        INIT_FCALL                                               'var_dump'
         17        FETCH_DIM_IS                                     ~11     !0, 'b'
         18        ISSET_ISEMPTY_DIM_OBJ                         0  ~12     ~11, 'b'
         19        SEND_VAL                                                 ~12
         20        DO_ICALL                                                 
         21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
146.66 ms | 1395 KiB | 15 Q