include()
————
It includes a spcified file.
It will produce a a warning if it fail to find the file and execute the remaining scripts

require
———–
It includes a spcified file.
It will produce a fatal error if it fail to find the file and stops the ececution

include_once()
——————-
It includes a spcified file.
a file has already been included, it will not be included again.
It will produce a a warning if it fail to find yhe file and execute the remaining scripts.

require_once()
———–
It includes a spcified file.
a file has already been included, it will not be included again.
It will produce a a fatal error if it fail to find the file and stops the ececution

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