Tests: added new tests of traits - piece of codes from PHP documentation

Signed-off-by: Jan Pecha <janpecha@email.cz>
Tests: removed useless code

Signed-off-by: Jan Pecha <janpecha@email.cz>
Tests: renamed file basic.php to basic.inc.php

Signed-off-by: Jan Pecha <janpecha@email.cz>