How can developers ensure that their PHP code is error-free and secure when working with XAMPP or other development environments?

Developers can ensure that their PHP code is error-free and secure when working with XAMPP or other development environments by following best practices such as validating input data, sanitizing user inputs, using prepared statements for database queries, and implementing proper error handling. Additionally, they can regularly update their PHP version and XAMPP components to patch any security vulnerabilities. 

// Example of validating input data in PHP
$username = $_POST['username'];

if (empty($username)) {
    echo "Username is required";
} else {
    // Proceed with further processing
}

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