PHP code for Contact-Us form with validation

This code is used for the basic php code of contact us form to submit the values to company mail.

HTML:

 <div class="col-md-4 col-sm-4 col-xs-12" style="padding: 20px 60px;">
  <form enctype="multipart/form-data" id="frmemail" name="frmemail">
        <fieldset class="margin-b">
            <h2>Contact US :</h2>
         <div class="form-group name">
           <label for="form_name">Name*</label>
           <input type="text" class="form-control" name="form_name" id="form_name" type="text" value="" required autofocus >
         </div>
         <div class="form-group name">
           <label for="form_phone">Phone No*</label>
           <input type="number" class="form-control" name="form_phone" id="form_phone" type="text" value="" required autofocus >
         </div>
         <div class="form-group name">
           <label for="form_email">Email*</label>
           <input type="email" class="form-control" name="form_email" id="form_email" value="" required autofocus >
         </div>
         <div class="form-group name">
           <label for="form_subject">Subject</label>
           <input type="text" class="form-control" name="form_subject" id="form_subject" value="">
         </div>
         <div class="form-group name">
           <label for="form_message">Message</label>
           <textarea name="form_message"  class="form-control" id="form_message" rows="5"></textarea>
         </div>
<!--
            <label for="form_name">Name:<input name="form_name" id="form_name" type="text" value="" required autofocus ></label>
            <label for="form_email">Email:<input type="email" name="form_email" id="form_email" value=""></label>
            <label for="form_msg">Message:<textarea name="form_msg" id="form_message" rows="5"></textarea></label>
-->
        </fieldset>
        <input type="submit" class="form-control" name="submit" id="submit" value="Submit">
    </form>

</div>

JS:

add this code in Html of contact-Us form.

<script>
  $("#frmemail").submit(function(event){
    event.preventDefault();
    $.ajax({
      type: "POST",
      url: "form_process.php",
      data: $("#frmemail").serialize(),
      success: function(){
        $('.success').fadeIn(1000);
       alert("submitted successfully!!");
    document.frmemail.reset();
      }
    });
  });

</script>

PHP:

<?php

if($_POST){

  $name = $_POST['form_name'];

    $email = $_POST['form_email'];

$subject = $_POST['form_subject'];

$phone= $_POST['form_phone'];

$message= $_POST['form_message'];

$header = "From:".$email."\r\n"; 

$header.= "MIME-Version: 1.0\r\n"; 

$header.= "Content-Type: text/plain; charset=utf-8\r\n";  

$header.= "X-Priority: 1\r\n";

    $mail = "\n\nName: ".$name."\n\nEmail: ".$email."\n\nPhone: ".$phone."\n\nMeassage: ".$message."\n\n This query submitted from : http://globusitindia.com";

  //send email 

  mail("info@xyz.com", " ".$subject, $mail, $header);

}

?>