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In PHP:
require vs. include?require_once vs. include_once?
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They are all ways of including files. Require means it needs it. Require_once means it will need it but only requires it once. Include means it will include a file but it doesn't need it to continue.
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, and include_once returns true .
Use require when the file is required by the application. Use include when the file is not required and application should continue when file is not found.
The include_once keyword is used to embed PHP code from another file. If the file is not found, a warning is shown and the program continues to run. If the file was already included previously, this statement will not include it again.
There are require and include_once as well.
So your question should be...
require vs. include?require_once vs. require The answer to 1 is described here.
The require() function is identical to include(), except that it handles errors differently. If an error occurs, the include() function generates a warning, but the script will continue execution. The require() generates a fatal error, and the script will stop.
The answer to 2 can be found here.
The require_once() statement is identical to require() except PHP will check if the file has already been included, and if so, not include (require) it again.
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