What are some best practices for writing PHP evaluation scripts for forms?

When writing PHP evaluation scripts for forms, it is important to validate user input to ensure data integrity and security. Some best practices include checking for required fields, validating input formats (such as email addresses or phone numbers), and sanitizing input to prevent SQL injection attacks. 

// Example of validating a form field for a required email address
$email = $_POST['email'];

if(empty($email)) {
    echo "Email address is required.";
} elseif(!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email address format.";
} else {
    // Proceed with form processing
}

Keywords

validation form handling input sanitization error handling security practices

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