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phpincluderequirerequire-once

php types of inclusion

I just read some articles about php's require / require_once respectively include / include_once and was just wondering when _once should be used? Is it just the performace aspect or can I run into any difficulties when including / requiring the same file multiple times?

Solution

  • Think about this scenario:

    <?php

function a() {
}

?>

    What's going to happen when you include/require it twice? "function a already declared".