What are some common pitfalls when using $_SERVER variables in PHP scripts?

One common pitfall when using $_SERVER variables in PHP scripts is not properly sanitizing user input, which can lead to security vulnerabilities such as injection attacks. To mitigate this risk, always validate and sanitize user input before using it in $_SERVER variables. 

$user_input = $_POST['user_input']; // Assuming user input is coming from a form submission

// Sanitize user input before using it in $_SERVER variables
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Now you can safely use the sanitized input in $_SERVER variables
echo $_SERVER['SERVER_NAME'] . ' says: ' . $clean_input;

Keywords

$_SERVER PHP scripts security vulnerabilities user input data validation

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