[RESOLVED] Single Quote vs Double Quote, What to default to?

A single quote or string literal can be used in PHP to declare a String, ignoring all variables names inside. It may also contains a double quote inside of it. A double quote on the other hand - still declaring a String - accepts variable names to be passed inside, preventing the need for concatenation. A single quote also does not parse escape sequences such as \n and \r. Is there a performance difference between the two types of String Literals? Why not use a double quote all the time and simply escape other double quotes if they are required in the String. Besides outputting variable names I don't see the point in having two strings.

Personally I mostly use double quotes as my default choice when creating Strings unless I need to display a lot of text that contains quotations. In the latter case if there isn't much text I will escape the double quotations but otherwise I would just use single quotes.

I was just wondering if there was a reason (besides displaying variable names) for PHP to have multiple methods to declare a String.

Of course there is a performance difference... you pointed it out yourself: "single quote also does not parse escape sequences such as \n and \r." -- since single quotes don't allow the parsing of \n or of variable names, it can be treated as literal text and doesn't need to be run through any further processing. I work from the opposite opinion... I use single quotes, unless I'm inserting $vars right into my text. And even then I'm not above .concatenating.my.strings.together either.

-tg

Outside of an extensive loop where a string is being echo'd is the performance difference that noticable?

meh... probably not... but I sleep better at nights :D

in the end it probably comes down to preference... as I mentioned I tend to use the single quote... probably to prevent me from doing something VBish by accident... :P

-tg

thanks for the clarification :check: