Are there any specific PHP functions or techniques that can streamline the process of validating form inputs and sending emails?

When validating form inputs and sending emails in PHP, it is helpful to use built-in functions like filter_var() to sanitize and validate input data, as well as the mail() function to send emails. Additionally, using PHP libraries like PHPMailer can simplify the process of sending emails by providing more advanced features and better security.

// Validate form input using filter_var()
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Send email using mail() function
$to = "recipient@example.com";
$subject = "New form submission";
$message = "Name: ".$_POST['name']."\nEmail: ".$_POST['email']."\nMessage: ".$_POST['message'];
$headers = "From: sender@example.com";

mail($to, $subject, $message, $headers);