Most efficient echo or print format?

[rtaylor]

Which is more machine efficient?

echo 'Hello '.$world;
echo('Hello '.$world);

echo 'Hello ',$world;
echo('Hello ',$world);

echo "Hello $world";
echo("Hello $world");

print(...

Does the answer change if several $variables are in the line?
Does the answer change if the 'plain text' is longer?
Is the , method valid?

Since it takes about the same effort to type or 'cut and paste'
any of the above, the most efficient might as well be used.
This is my apology for asking about machine efficiency.

Robert

[Anon]

Well, in your example it is trivial, because your only printing two words 😉 But for the point your trying to make

echo 'Hello '.$world;

Is the most efficient. What you really need to remember is when enclosed in single quotes, the text isn't evaluated, so there is less parsing overhead. So if you have a line with many variables passed into it (i.e. an SQL insert) then you might want to use double quotes " because the code would therefore be easier to understand. But if you have just a long plain text strings, always use single quotes. Really, over one line or even 30 it doesn't make a huge impact, but if your planning a large scale site it does matter. Hope that helps.

Chris King