What are the differences between require and include in PHP?

Question

I use the pretty large Library PHP Image Workshop (http://phpimageworkshop.com/) at my project. It is about 75,5 KB. Everything works fine but if I try to include a 15 KB file with country codes, it fails. With the other files I easily get over 100 KB inclusion size, so my question; Is there a size limitation for include?

Answer 1

The key difference between require() and include() is that if you require() a file that can't be loaded (e.g. if it isn't there) then it generates a fatal error which will halt the execution of the page completely, and no more output will be generated. On the other hand, if you include() a file that can't be loaded, then this will merely generate a warning and continue building the page.

require will produce a fatal error (E_COMPILE_ERROR) and stop the script
include will only produce a warning (E_WARNING) and the script will continue

Answer 2

You may like to know Include_once also -

include - will include the specified file.
include_once - will include the file only once even if the code of the file has been included before.

Now coming to your query -
The include and require are almost similar except the way they handle failures. include produces a warning and require produces a fatal error i.e. does not allow the processing of the page.

Answer 3

Both require and include are used to include a file but they differ in the way, they handle the failures.
require sends a fatal error and stops the page execution.whereas include gives a warning and continues building the page.