trying to use the forn element in html. wrote a simple form, and a simple php page, but every time i hit the submit a blank page is appearing nomatter what im doing in the php:
my html form:
<form id="contact-main-form"  method="post" action="process.php">
<input id="contact-small-last-name-textbox"name="lastName" 
  type="text" placeholder="last name">
<input id="submit" type="submit" value="send">
</form>
my php page :
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <?php
    echo $firstName ;
    print "hello";
    ?>
</body>
thank you ;
 
     
    