Which is better on performance: double quoted strings with variables or single quoted strings with concatenations?

Question

I know that using single quotes around a string in PHP is faster than using the double quotes because PHP doesn\'t need to check for variable presence in the single quoted s

Answer 1

Without testing (which is the only proper way to resolve such issues) I'd say single quoted strings with concatenation, because the strings don't have to be parsed. But it's very implementation-dependent.

And double-quoted strings have less visual clutter and cruft. So I'd side with Jonathan in saying that the performance difference is likely not that significant that you should be worried about it; rather, go with the way that is easier to maintain and consistent within your project.