What is the potential issue with including a file within a function in PHP?

Including a file within a function in PHP can lead to potential issues with scope and re-including the same file multiple times, which can cause errors or unexpected behavior. To solve this, you can use the `require_once` or `include_once` functions to include the file only once in the entire script execution, ensuring that the code is not duplicated and that variables and functions are accessible within the function. 

function myFunction() {
    require_once 'myfile.php';
    
    // Function logic that uses code from myfile.php
}

Keywords

include require function scope namespace

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