What are the best practices for including external PHP files within while loops to prevent errors?

When including external PHP files within while loops, it's important to make sure that the included file doesn't redefine functions or variables that are already defined in the main file. To prevent errors, you can use the `require_once` or `include_once` functions instead of `require` or `include` to ensure that the file is only included once. 

while ($condition) {
    require_once 'external_file.php';
    // Rest of the code within the loop
}

Keywords

include require include_once require_once scope

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