[zendframework/zf2#3984] Import ArrayObject as PhpArrayObject
[zendframework/zf2#3984] Import ArrayObject as PhpArrayObject

- and update class declaration to extend PhpArrayObject

weierophinney/zend-stdlib,akrabat/zend-stdlib,sravanchandj/zend-stdlib,ezimuel/zend-stdlib,php-refactoring/zend-array-utility,adamlundrigan/zend-stdlib,MadCat34/zend-stdlib