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In PHP what is the use case for include instead of require when including PHP scripts?

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In PHP one can either use include or require to include files, the difference is that if the file doesn't exist it will emit a fatal error and halt with a require and only emit a warning with include.

Normally would rather my code fail if code is missing and require that it be fixed rather than just throw a warning which might get ignored. The one solid use case I have seen for include was a bitcoin mining hack where a require might cause the error to show up in the logs sooner.

What is the use case for PHP's include vs require?

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The use case for require statements is fairly obvious. It can be used to include code from other PHP files into the current file. This allows you to split your code across multiple files.

There are no good reasons to use an include statement in PHP. The only difference between include and require is that include produces an E_WARNING level error, while require produces an E_COMPILE_ERROR level error, which causes the script to exit. An include statement might be occasionally useful when you are unsure whether the included file will exist during runtime, however a require prefixed with a file_exists is about ten times faster than a @include statement (n.b. the @ operator will silence any error messages generated by the proceeding expression).

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