Different include_once, require_once PHP

Hi proficient, Could an anybody give a description of different between includeonce, requireonce in PHP with An Example program, an already I have search this but I can’t take that example so anybody tell description to me for this question.

                                  Thanks in advance for your help.

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include_once includes a file and throws a warning (but keeps going) if not found.

require_once includes a file and EXITS with a FATAL ERROR if not found.

Think of it like the difference between asking someone if they can do something - and telling them to do it.