What common mistakes can lead to errors in PHP contact form scripts?

One common mistake that can lead to errors in PHP contact form scripts is not properly sanitizing user input, which can leave the form vulnerable to SQL injection attacks. To solve this issue, always use functions like htmlspecialchars() or mysqli_real_escape_string() to sanitize user input before using it in SQL queries. 

// Sanitize user input using mysqli_real_escape_string()
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$message = mysqli_real_escape_string($conn, $_POST['message']);

Keywords

SQL injection XSS attacks form validation error handling mail function

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