What are common challenges faced when processing form data in PHP?

One common challenge faced when processing form data in PHP is ensuring that the data is sanitized and validated to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, it is recommended to use functions like htmlspecialchars() to escape special characters and filter_input() to validate input data. 

// Sanitize and validate form data
$name = htmlspecialchars($_POST['name']);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Process the sanitized and validated data
// (e.g. store in database, send email, etc.)

Keywords

SQL injection data validation XSS attacks CSRF protection form submission errors

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