fix bug #72254 - get_object_vars with numerical properties

[schlndh]

The problem is that PHP 5.6 uses add_assoc_zval_ex function to add properties to returned array, which handles numerical keys separately, whereas PHP 7.0 either returns the properties hashtable directly (in which case I guess that numerical keys are not handled separately) or adds properties to returned array using zend_hash_str_add_new/zend_has_add_new functions which again don't handle numerical keys separately.

I suspect that the reason why numerical keys are not accessible using the PHP 7 code is that when accessing an array, numerical keys are always handled separately and because they are stored as ordinary string keys, they cannot be accessed.

I therefore switched back to add_assoc_zval_ex function and removed the code that just returned properties hashtable, since it can contain numerical keys stored as strings and would need to be duplicated anyway.

[php-pulls]

Comment on behalf of cmb at php.net:

This issue has already been fixed by PR #2142, which has been already merged. Also the respective bug report has been closed, so I'm closing this PR.

Thanks for the PR, anyway!