database - Notice: Undefined index when tryig to log in php -


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ive got problems when trying log in page. wrong username , password error notice: undefined index..... line 30-32 here code: 

<?php  include("start.html"); include("db-connect.php"); include("sjekk.php"); ?>  <form method="post" action="" id="logginn" name="logginn"> <fieldset class="container"> <legend>logg inn</legend> <table>     <tr>     <td><label>brukernavn </td><td> <input type="text" id="brukernavn" name="brukernavn"> <br/></label></td>     </tr>     <tr>     <td><label>passord </td><td>  <input type="password" id="passord" name="passord"> <br/></label></td>     </tr>     <tr>     <td><input type="submit" value="logg inn" id="logginnknapp" name="logginnknapp" /> </td>     <td><input type="reset" value="nullstill" id="nullstill" name="nullstill" /> <br /></td>     </tr>     </table> </fieldset> </form> <br />   <?php    $brukernavn=$_post ["brukernavn"]; $passord=$_post["passord"];  $login=$_post[logginnknapp];  if($login) { if (!sjekkbrukernavnogpassord($brukernavn,$passord))      {  mysql_query($sqlsentence) or die ("<p>feil brukernavn/passord.</p>".file_get_contents("slutt.html"));      } else             {         print("<p>du er n&aring logget inn.</p>");     }                }   if (!sjekkbrukernavnogpassord($brukernavn,$passord))   {     print("feil brukernavn/passord <br />"); } else   {     @session_start();     $_session["innlogget"]=1;        print("i menyen til venstre finner du ulike valg som kan utføres ved bruk av denne applikasjonen"); }    ?> <p>ny bruker?</p> <a href="reg-bruker.php">registrer deg her</a> <?php include("slutt.html"); ?>

dont know why these errors, been looking on codes couple of days , cant figuere out

you error, because index of $_post array doesn't exists. first $_post[logginnknapp] should $_post['logginnknapp'] , should test if variable exists before assign value new variables:

if(isset($_post["brukernavn"]) && isset($_post["passord"]) && isset($_post['logginnknapp'])) {    $brukernavn=$_post ["brukernavn"];    $passord=$_post["passord"];     $login=$_post["logginnknapp"];    //the rest of code }

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