Description:
------------
PHP Notice:  Array to string conversion in /data/x.php on line 11
PHP Notice:  Undefined property: x::$Array in /data/x.php on line 11
PHP Fatal error:  Uncaught Error: Function name must be a string in /data/x.php:11
Stack trace:
#0 {main}
  thrown in /data/x.php on line 11

Test script:
---------------
<?php
class x {
    function x() {
    }
    function common() {
    }
}

$x = new x();
$arr = ['x', 'common'];
$x->$arr[1]();

Actual result:
--------------
PHP Notice:  Array to string conversion in /data/x.php on line 11
PHP Notice:  Undefined property: x::$Array in /data/x.php on line 11
PHP Fatal error:  Uncaught Error: Function name must be a string in /data/x.php:11
Stack trace:
#0 {main}
  thrown in /data/x.php on line 11