问题
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Opening/closing tags & performance?
This is a newbie question, but I could not find a clear answer on the net, so please don't laugh :)
Does opening and closing php tags (
<? php code ?>) multiple times increases page load time?How about using include templatepath multiple times?
Thank you
回答1:
Theoretically yes, but the difference is so miniscule that in almost all cases it wouldn't matter.
Not sure about what you mean. If there is a possibility of a file being included multiple times, use
include_onceorrequire_once. This will prevent multiple loads and prevents errors like 'Cannot redeclare class'. Again this is more expensive thanincludeandrequire, but more stable.
As a side note, your questions are not anything related to code, and I am sure these have already been asked and answered multiple times in SO, so please try to search/ask better next time :)
All the best!
回答2:
Does opening and closing php tags (
<? php code ?>) multiple times increases page load time?
NO - I'm answering even though you've accepted, because everyone deserves to know what actually happens.
When PHP parses a file it tokenises everything outside of the tags as T_INLINE_HTML.
This is turned directly into a ZEND_ECHO
Closing and re-opening a tag is exactly the same speed as if you were echoing the html from within a single <?php ?> block.
How about using include templatepath multiple times?
Yes the more files you include, the longer it will take to load a page, especially if they have to be read from disk each time and you are not utilising various caching mechanisms.
来源：https://stackoverflow.com/questions/11853130/does-opening-and-closing-php-tags-multiple-times-increases-page-load