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POUndefined index for ID with $_GET
 

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    <p>Well, yet another undefined index appears :</p> <p>I am trying to change a select row in a database, but so far it doesn't seem to work, I only get </p> <blockquote> <p><code>Notice: Undefined index: EierID in C:\WampServer\www\Hundeklubben\ChangeO.php on line 19.</code></p> </blockquote> <p>I have tried some fixes, but none worked.</p> <pre><code>&lt;?php require_once('Connections/hundeklubb.php'); ?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;Endring av eier&lt;/title&gt; &lt;link rel="stylesheet" href="index.css" /&gt; &lt;/head&gt; &lt;body&gt; &lt;?php if(isset($_GET['EierID'])){ $name = $_GET['EierID']; } //Tried with both $_GET and $_POST ?&gt; &lt;?php $UID = (int)$_GET['EierID']; $query = mysql_query("SELECT * FROM eiere WHERE EierID = '$UID'") or die(mysql_error()); if(mysql_num_rows($query)&gt;=1){ while($row = mysql_fetch_array($query)) { $navn = $row['Navn']; $bosted = $row['Bosted']; } ?&gt; &lt;form name="form1" action="update.php" method="POST" id="form1"&gt; &lt;input type="hidden" name="ID" value="&lt;?=$UID;?&gt;"&gt; Navn: &lt;input type="text" name="ud_navn" value="&lt;?=$navn?&gt;"&gt;&lt;br&gt; Bosted: &lt;input type="text" name="ud_bosted" value="&lt;?=$bosted?&gt;"&gt;&lt;br&gt; &lt;input type="Submit" value="Oppdater"&gt; &lt;/form&gt; &lt;?php }else{ echo 'No entry found. &lt;a href="javascript:history.back()"&gt;Go back&lt;/a&gt;'; } ?&gt; &lt;?php var_dump($UID); ?&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The <code>var_dump</code> gives me <code>int 0</code>. I'm not sure what it is supposed to be.</p> <p><strong>update.php</strong></p> <pre><code>&lt;?php require_once('Connections/hundeklubb.php'); ?&gt; &lt;?php $ud_ID = (int)$_POST["ID"]; $ud_navn = mysql_real_escape_string($_POST["ud_navn"]); $ud_bosted = mysql_real_escape_string($_POST["ud_bosted"]); $query="UPDATE eiere SET navn = '$ud_navn', bosted = '$ud_bosted' WHERE ID='$ud_ID'"; mysql_query($query)or die(mysql_error()); if(mysql_affected_rows()&gt;=1){ echo "&lt;p&gt;($ud_ID) Record Updated&lt;p&gt;"; }else{ echo "&lt;p&gt;($ud_ID) Not Updated&lt;p&gt;"; } ?&gt; </code></pre>
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    1. USThe Last Melody
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    1. COThe notice cant be the reason that your update isnt working. Try to echo or print the query in update.php to your browser. Then run this query in a program like PHPMyAdmin to see exactly whats wrong.
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      1. USJoey
    2. COYou are using [an **obsolete** database API](http://stackoverflow.com/q/12859942/19068) and should use a [modern replacement](http://php.net/manual/en/mysqlinfo.api.choosing.php).
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    3. COWhy do we get exactly this question 10 times a day every day? Just read the error message first.
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