What are some common mistakes to avoid when passing variables from HTML to PHP?

One common mistake to avoid when passing variables from HTML to PHP 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 sanitize user input using functions like htmlspecialchars() or mysqli_real_escape_string() before using it in your PHP code. 

// Example of sanitizing user input before using it in PHP code
$name = isset($_POST['name']) ? htmlspecialchars($_POST['name']) : '';
$email = isset($_POST['email']) ? htmlspecialchars($_POST['email']) : '';

Keywords

HTML PHP variables data validation security

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