A few differences between require and include in PHP

If the php.ini configuration file is configured with URL fopen wrappers, then require can use a URL that contains a call to the remote file

Require cannot contain a control structure and cannot contain a return statement, resulting in a processing error.

Require will replace the contents of the included file at the first execution, and the include will be called again each time the call is taken. So require can not contain different files in the cycle weight.

Require can access variables in the current scope

Require an error immediately stops running, reports an exception, and the include displays an error message and resumes execution.

In a conditional statement, require, regardless of whether the condition is true or not, the content that is contained will be introduced, even if there is no chance of execution.

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