The difference between require() and include()

Here is the explaination from PHP manual.

From PHP manual:-   

require() and include() are identical in every way except how they handle failure. include() produces a Warning while require() results in a Fatal Error. In other words, don’t hesitate to use require() if you want a missing file to halt processing of the page. include() does not behave this way, the scriptwill continue regardless. Be sure to have an appropriate include_path setting as well.