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require_once(), require(), include().What is difference between them?
(PHP)
5 Respuestas
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All functions can be used to include a php file in another one.
The use of Require will generate an error if the file not found while Include() doesn't .
Require_once() If it is found that the file has already been included, calling script is going to ignore further inclusions.
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You know the answer already to provide it yourself.
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require() includes and evaluates a specific file, while require_once() does
that only if it has not been included before (on the same page). So,
require_once() is recommended to use when you want to include a file
where you have a lot of functions for example. This way you make sure you
don’t include the file more times and you will not get the “function re-
declared” error.
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But u r not quite right.....
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required():when use this function while if file is not found then its give to error so it is required for code.
required_once():If we call one file two or more times then its call only once so,this is ignore other calls for same files.
include(): If file is present then its included in to code or not then not generate error.So when file's code is not important for code while we can use this function.