How can you ensure that form data is properly sanitized and validated before displaying it back to the user in PHP?

To ensure that form data is properly sanitized and validated before displaying it back to the user in PHP, you can use functions like htmlspecialchars() for sanitization to prevent XSS attacks and filter_var() for validation to ensure the data meets specific criteria. It's important to sanitize user input to prevent malicious code injection and validate it to ensure it meets the expected format or type. 

// Sanitize form data
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);

// Validate form data
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email format";
} else {
    echo "Name: " . $name . "<br>";
    echo "Email: " . $email;
}

Keywords

filter_input htmlspecialchars validation XSS security

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