Description:
------------
I like see string "test"

$variable = "test";
$var_1 = "variable";
echo ${$var_1}; //work

$var_2['x2'] = "test";
$var_2['x'] = "var_2";
echo ${$var_2['x']}['x2']; //work

$var_3['x2'] = "test";
$var_3['x'] = "var_3['x2']";
echo ${$var_3['x']}; //dont work

Sorry for my English.

Test script:
---------------
$var_3['x2'] = "test";
$var_3['x'] = "var_3['x2']";
echo ${$var_3['x']};

Expected result:
----------------
Notice: Undefined variable: var_3['x2']

Actual result:
--------------
string "test"