What is the best way to add two strings together?

Question

I read somewehere (I thought on codinghorror) that it is bad practice to add strings together as if they are numbers, since like numbers, strings cannot be changed. Thus, ad

Answer 1

As the others said, $str1 . $str2 is perfectly OK in most cases, except in (big) loops.
Note that you overlook some solutions:

$output = "$str1$str2";

and for large number of strings, you can put them in an array, and use implode() to get a string out of them.

Oh, and "adding strings" sounds bad, or at least ambiguous. In most languages, we prefer to speak of string concatenation.