PHP echo in a HTML Page -

i have contact.html page have form on. form action goes .php page handle email, nothing special. on page have:

<?php function check_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; }  $firstname = check_input($_request['firstname']); $lastname = check_input($_request['lastname']); $email = check_input($_request['email']); $phone = check_input($_request['phone']); $message = check_input($_request['message']); $human = check_input($_request['human']); $webpackage = check_input($_request['webpackage']); $webdesign = check_input($_request['webdesign']); $customdesign = check_input($_request['customdesign']);  if ($human == 5) {  $to = "****.com"; $subject = "from ****";  $body = " from: $firstname  $lastname\n\n e-mail: $email\n\n phone:     $phone\n\n message:\n\n $message\n\n web package:$webpackage\n\n web     design:$webdesign\n\n custom design:$customdesign";   mail ($to, $subject, $body); header('location: index.html'); } else { $result="<div class=\"alert alert-danger\">sorry there error sending     message. please go , check anti-spam answer</div>"; }  ?> 

i have simple box equals 5 checking value for. works , email sent info. but if not equal 5 problem starts. page goes action.php page , blank.

my html on contact.html page is:

    <div class="form-group">                 <div class="col-sm-10 col-sm-offset-2">                     <?php echo($result); ?>                 </div>             </div> 

using action.php page through form. else .html:

 <form class="form-horizontal" id="contact-form" method="post" action="/action.php"> 

is there way this? have work around echo error .php page. works if !=5 not want do. may tell, not php literate.

you can set variable in $_session[] array, , in "else" section use header() redirect page display value stored.

see example in other answered question:

displaying message after redirecting user web page