What potential issues can arise when including variables directly in a PHP file instead of passing them via URL or POST?

Including variables directly in a PHP file can lead to security vulnerabilities such as code injection and exposure of sensitive information. It is best practice to pass variables via URL or POST to prevent these issues. 

// Example of passing variables via POST method
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $variable1 = $_POST['variable1'];
    $variable2 = $_POST['variable2'];
    
    // Use the variables safely in your code
}

Keywords

security vulnerability injection attacks XSS data leakage code readability

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