PHP Include & Require

What is the difference between include and require?

Answer
Require() and include() are the same with respect to handling failures. However, require() results in a fatal error and does not allow the processing of the page. i.e. include will allow the script to continue.   

Explain the differences between require and include, include_once?

Answer
Include() will include the file specified.

Include_once() will include the file only once even if the code of the file has been included before.

Require() and include() are the same with respect to handling failures. However, require() results in a fatal error and does not allow the processing of the page.

What is the difference between include and require in PHP?

The include() and require() are almost similar except the way they handle failures. include() produces a warning and require() produces a fatal error. To halt processing of the page, use require(). The same operation will not halt by using include(). It should be ensured that the include_path settings are proper. Both are used for inserting the file content into PHP file prior to its execution by the server.