contact.php mail function

<?php

  $firstname = $secondname = $phone = $email = $message = "";

  if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $firstname = test_input($_POST["firstname"]);
    $secondname = test_input($_POST["secondname"]);
    $phone = test_input($_POST["phone"]);
    $email = test_input($_POST["email"]);
    $detail = test_input($_POST["message"]);

    $messagemain = 'Firstname' . $firstname ."\r\n" .
      'Secondname' . $secondname ."\r\n" .
      'Phonenumber' . $phone ."\r\n" .
      'Email' . $email ."\r\n" .
      'Message' . $detail ;

    $to      = 'mikhilkj888@gmail.com';
    $subject = 'Message from user';
    $message = $messagemain;
    $headers = 'From: webmaster@example.com' . "\r\n" .
        'Reply-To: webmaster@example.com' . "\r\n" .
        'X-Mailer: PHP/' . phpversion();

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

    header("location:contact.php");

  }

  function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
  }
?> 


<?php

  $firstnamef = $secondnamef = $companynamef = $messagef  = "";

 // if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (isset($_POST["submitf"])) {

    $firstnamef = test_input($_POST["firstnamef"]);
    $secondnamef = test_input($_POST["secondnamef"]);
    $companynamef = test_input($_POST["companynamef"]);
    $messagef = test_input($_POST["messagef"]);

    $messagemainf = 'Firstname' . $firstnamef ."\r\n" .
      'Secondname' . $secondnamef ."\r\n" .
      'Company Name' . $companynamef ."\r\n" .
      'Message' . $messagef ;

    $tof      = 'mikhilkj888@gmail.com';
    $subjectf = 'Message from user';
    $messagef = $messagemainf;
    $headersf = 'From: webmaster@example.com' . "\r\n" .
        'Reply-To: webmaster@example.com' . "\r\n" .
        'X-Mailer: PHP/' . phpversion();

    mail($tof, $subjectf, $messagef, $headersf);

    header("location:footer-form.php");

  }

  function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
  }
?> 


<form class="pr-form" method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">

	<div class="input-con">
		<input type="text" placeholder="First Name" name="firstname">
		<input type="text" placeholder="Second Name" name="secondname">
	</div>
	
	<div class="input-con">
		<input type="text" placeholder="Phone Number" name="phone">
		<input type="text" placeholder="Email" name="email">
	</div>
	
	<div class="input-con">
	<textarea placeholder="Message" name="message"></textarea>
	</div>
	
	<input type="submit" value="Submit" name="submit">
	
</form>



        <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
          <div class="footer-text-fields">
            <input type="text" placeholder="FIRST NAME" name="firstnamef">
            <input type="text" placeholder="SECOND NAME" class="right-text" name="secondnamef">
            <input type="text" placeholder="CONPANY NAME" class="comp_name" name="companynamef">
            <textarea placeholder="MESSAGE" name="messagef"></textarea>
            <input type="submit" class="submit" name="submitf" value="SUBMIT">
          </div>
        </form>