About modifying the content of an HTML file through php before loading the HTML file -

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say instance want go main log in page html/js if password/username fail match when run php. able access main login html page , make div contains error message visible.

here code snippets example. works fine, don't how can load index page without telling user went wrong. i've been doing googling haven't managed right. 

<?php //this in separate file "checklogin.php" .  .  .      if ($count == 1) {             session_start();             $_session['loggedin'] = true;             header('location: loggedin.php');         }          else {             header('location: index.php');         }    . . . ?>    <html> //separate file "index.php"     <body>     .     .     .         <div id = "nomatch" name = "nomatch" style = "display:none">          <p>            username , password don't match          </p>        </div>     .     .     .     </body>  </html>

you add parameter index.php redirect :

header('location: index.php?error');

your index.php becoming :

<?php if (isset ($_get['error'])) { ?> <div id = "nomatch" name = "nomatch" style = "display:none">      <p>        username , password don't match      </p>    </div> <?php } ?>

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