Hi there..

what's the difference between require, include and include_once?

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cheers
Aman

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 script will continue regardless. Be sure to have an appropriate include_path setting as well.

The include_once() statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the include() statement, with the only difference being that if the code from a file has already been included, it will not be included again. As the name suggests, it will be included just once

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Nasee
True Faith never Fails

Difference between require, include and include_once?

include will include the file, and should it fail, keep running the script.

require will include the file, and should it fail, the script will stop.

include_once and require_once are even more handy if you write scripts that run and include each other, because including() a file more than once will generate errors, but include_once() will only include the file once, regardless of how many times it is called.

ThankQ
KiruthikaSambandam

Hi,

require_once() and include_once() are both the functions to include and evaluate the specified file only once. If the specified file is included previous to the present call occurrence, it will not be done again.

But require() and include() will do it as many times they are asked to do.