这些方法之间的性能差异

Question

Is there any advantages/disadvantages to either of these statements over the other one:

<?php 
$test = 1;
$test2 = 2;
$test3 = $test + $test2;
echo "<p>Hello World</p>"; 
?>

OR

<?php 
$test = 1;
$test2 = 2;
$test3 = $test + $test2;
?>
<p>Hello World</p> 

What i'm asking is, if i'm outputting a page using PHP should i keep closing the php tags and stick normal HTML in or echo out the HTML? Which is better?

Answer 1

if you want do be realy exact, there are three options:

the slowest:

echo "<p>Hello World</p>"; 

a bit faster (no need to check for inline-valiables because of single quotes):

echo '<p>Hello World</p>'; 

the fastest (no php-interpreting at all):

<p>Hello World</p>

but between all of this, the difference would be so minimalistic that you won't ever notice it - much more important: make your code redable and do it the same way everywhere, so nobody who's reading your code (and has to maintain it) gets confused. i personally would prefer the third method (so i can use code-completition in my IDE), but it's your choice - i know a lot of people who output everything using echo.

EDIT: to be complete, there are some more possibilitys i didn't mentioned like heredoc- and nowdoc-syntax, but this are basically the same as double/single-quotes... also, you could write print instead of echo and so on, but that wouldn't make a difference.