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The mail() Function:

      <?php
        $to = "recipient@example.com";
        $subject = "Hello";
        $message = "This is a test email sent from PHP.";
        $headers = "From: sender@example.com\r\n" .
            "Reply-To: sender@example.com\r\n" .
            "X-Mailer: PHP/" . phpversion();

        if (mail($to, $subject, $message, $headers)) {
          echo "Email sent successfully.";
        } else {
          echo "Failed to send email.";
        }
      ?>

The date() Function:

      <?php
        echo "Today is " . date("Y-m-d") . "";
        echo "The time is " . date("h:i:sa") . "";
        echo "Today is " . date("l") . "";
      ?>

The filter_var() Function:

      <?php
        $email = "user@example.com";
        if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
          echo "$email is a valid email address.";
        } else {
          echo "$email is not a valid email address.";
        }
      ?>

Conclusion: