What common mistakes are made when using PHP for form submission?

One common mistake when using PHP for form submission is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting 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 or displaying it on the webpage. 

// Example of sanitizing user input using htmlspecialchars()
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);
$message = htmlspecialchars($_POST['message']);

Keywords

SQL injection cross-site scripting form validation CSRF protection error handling

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