What are some best practices for handling form field data validation in PHP to ensure accuracy and security?

When handling form field data validation in PHP, it is crucial to ensure both accuracy and security by validating user input to prevent malicious attacks like SQL injection or cross-site scripting. One best practice is to use PHP's built-in functions like filter_var() or regular expressions to validate input data before processing it further. 

// Example of validating an email address using filter_var()
$email = $_POST['email'];

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Proceed with processing the email address
} else {
    // Handle invalid email address input
}

Keywords

Sanitization Validation Regular Expressions Filter Functions Cross-Site Scripting

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