http://register-php157.rhcloud.com/ http://test-php157.rhcloud.com/
IF php/ dir exists THEN DocumentRoot=php/
ELSE IF public/ dir exists THEN DocumentRoot=public/
ELSE IF public_html/ dir exists THEN DocumentRoot=public_html/
ELSE IF web/ dir exists THEN DocumentRoot=web/
ELSE IF www/ dir exists THEN DocumentRoot=www/
ELSE DocumentRoot=/