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PHP maintains four direct functions for bringing in code from other files/sources.

require() and require_once() bring code in from another source and PHP will refuse to run if it cannot load those files.

include() and include_once() bring code in just the same, but your script will continue to run if those files could not be parsed. Thus you would use it if the code is optional and not necessary.

The _once() functions tell PHP to keep a list of required/included files so far and ignore the request if it's already been done somewhere else. Otherwise, it'll parse the file twice and could cause your script to fail because the functions, classes, etc defined during the second load would conflict with those loaded the first time.

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