How to add space to docx document using PhpWord?

Question

PHP

Spaces between words are added, but not added at the end.
I'm trying to do this:

$document->setValue('object', $_POST['object'] . ', ' . ' ');

but after the comma, the space does not want to be added.
I also tried to specify instead of a space    , and in this case, when trying to open docx, an error message appears and the document does not open.