I use single quotes most of the time, because when developing in PHP, single quoted-string are in no way altered, which is what I want. When I use
echo "$xyz";
In PHP, $xyz gets evaluated, which is not what I want. Therefore I always use '
instead of "
when it comes to web development. So I ensure at least string-consistency when it comes to PHP/JavaScript.
Unfortunately this can't be done in Java or Objective-C, where ''
stands for character and ""
stands for string. But this is another question.