```php
<?php
<?php
$a = [];
$x = @$a['key1']['key2'];
```

```
~/noodlehaus $ php -d vld.active=1 -d vld.execute=0 -f test1.php
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /Users/jesdomingo/noodlehaus/test1.php
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a, !1 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   EXT_STMT
         1        INIT_ARRAY                                       ~0
         2        ASSIGN                                                   !0, ~0
   3     3        EXT_STMT
         4        BEGIN_SILENCE                                    ~2
         5        FETCH_R                      local               $3      'a'
         6        FETCH_DIM_R                                      $4      $3, 'key1'
         7        FETCH_DIM_R                                      $5      $4, 'key2'
         8        END_SILENCE                                              ~2
         9        ASSIGN                                                   !1, $5
   4    10      > RETURN                                                   1

branch: #  0; line:     2-    4; sop:     0; eop:    10; out1:  -2
path #1: 0,
```
```php
<?php
$a = [];
$x = null;
if (isset($a['key1']['key2'])) {
  $x = $a['key1']['key2'];
}
```
```
~/noodlehaus $ php -d vld.active=1 -d vld.execute=0 -f test2.php
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 9, Position 2 = 14
Branch analysis from position: 9
Jump found. Position 1 = 14
Branch analysis from position: 14
Jump found. Position 1 = -2
Branch analysis from position: 14
filename:       /Users/jesdomingo/noodlehaus/test2.php
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a, !1 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   EXT_STMT
         1        INIT_ARRAY                                       ~0
         2        ASSIGN                                                   !0, ~0
   3     3        EXT_STMT
         4        ASSIGN                                                   !1, null
   4     5        EXT_STMT
         6        FETCH_DIM_IS                                     $3      !0, 'key1'
         7        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~4      $3, 'key2'
         8      > JMPZ                                                     ~4, ->14
   5     9    >   EXT_STMT
        10        FETCH_DIM_R                                      $5      !0, 'key1'
        11        FETCH_DIM_R                                      $6      $5, 'key2'
        12        ASSIGN                                                   !1, $6
   6    13      > JMP                                                      ->14
   7    14    > > RETURN                                                   1

branch: #  0; line:     2-    4; sop:     0; eop:     8; out1:   9; out2:  14
branch: #  9; line:     5-    6; sop:     9; eop:    13; out1:  14
branch: # 14; line:     7-    7; sop:    14; eop:    14; out1:  -2
path #1: 0, 9, 14,
path #2: 0, 14,
```