What are common issues faced when using PHP forms on a website?

Issue: One common issue faced when using PHP forms on a website is form validation. Without proper validation, users can submit incorrect or malicious data, leading to potential security vulnerabilities or errors in the application. 

// Example of form validation in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Validate name
    if (empty($name)) {
        $errors[] = "Name is required";
    }
    
    // Validate email
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $errors[] = "Invalid email format";
    }
    
    // Display errors
    if (!empty($errors)) {
        foreach ($errors as $error) {
            echo $error . "<br>";
        }
    } else {
        // Process form data
    }
}

Keywords

SQL injection XSS attacks form validation CSRF protection file uploads

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