How can PHP developers ensure that included files based on GET variables exist before including them?

To ensure that included files based on GET variables exist before including them, PHP developers can use the `file_exists()` function to check if the file exists before including it. This helps prevent errors and vulnerabilities that can occur if a non-existent file is included. 

if(isset($_GET['file']) && file_exists($_GET['file'])) {
    include($_GET['file']);
} else {
    echo "File not found";
}

Keywords

PHP developers include GET variables file existence.

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