What potential issues can arise when using PHP scripts to process form data?

One potential issue when using PHP scripts to process form data is the lack of proper input validation, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, it is crucial to sanitize and validate user input before processing it in the script. 

// Example of sanitizing and validating user input
$name = htmlspecialchars($_POST['name']);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Further validation can be added as needed
if (empty($name) || empty($email)) {
    // Handle error - input is not valid
} else {
    // Process the form data
}

Keywords

SQL injection cross-site scripting data validation sanitization error handling

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