what is the relationship between files in view viewc

[leezi]

http://localhost/demos/blog

"$this->render('error', $this->data);"
the code above use error.html in view folder to render the page,but i found there exists another error.php file in viewc file,if I delete the error.php and request the url ,the deleted file will appear again,and if I modify the error.php,and this will reflact in the page.who can tell me why ?

what i found is that the system will use error.html to produce error.php,and will use error.php later if the file exists,if not ,produce it.

[RichardM]

Its a cacheing mechanism to avoid having to recompile view templates on every page load.