Troubleshooting "Notice: Undefined index" error - php

Question

could anyone check my code why i get a notice like this?
Notice: Undefined index: id in C:\xampp\htdocs\HRPO\module\reports\jo\view_jo.php on line 76
line 76:
$id=$_GET['id'];
here is the first could of which I get my id:
<?php
echo "<dl>";
echo "<dt width = 200 id=\"label\">"."SSA"."</dt>";
echo "<dd align='right'>";
$result = mysql_query("SELECT ssa.first_name,ssa.SSA_ID
FROM staffing_specialist_asst ssa
left join jo_partner jp on jp.SSA_ID = ssa.SSA_ID
group by first_name") or die(mysql_error());
$dropdown = "<select name=\"SSA_ID\" style=\"position:relative; left:-51px;\">\n";
while($row = mysql_fetch_assoc($result)) {
$dropdown .= "\r\n<option value='{$row['SSA_ID']}'>{$row['first_name']}</option>";
}
$dropdown .= "\r\n</select>";
echo $dropdown;
echo "</dd>";
echo "</dl>";
?>
and the second code where line 76 is found:
<?php
$id=$_GET['id'];
if(isset($_POST['submit']))
{
$datefrom = $_POST['timestamp'];
$dateto = $_POST['timestamp1'];
//echo $option;
$_SESSION['datefrom'] = $datefrom;
$_SESSION['dateto'] = $dateto;
if(( $datefrom == NULL) || ($dateto == NULL)){
echo "<SCRIPT LANGUAGE='javascript'> confirmationError() ;</SCRIPT>";
exit();
}
$final =("SELECT distinct jp.receivedDate as rDate, ssa.first_name as saFName, ssa.last_name as saLName,job.client_order_number as joNum,
job.job_order_type as joType, job.job_title as joTitle, cl.name as clientName
,ss.first_name as ssFName,ss.last_name as ssLName,jp.acknowledgeDate as aDate, stat.status as stat
FROM staffing_specialist_asst ssa
left join jo_partner jp on ssa.SSA_ID = jp.SSA_ID
left join job_order job on jp.job_order_number = job.job_order_number
left join jo_status stat on job.job_order_number = stat.job_order_number
left join staffing_specialist ss on jp.SS_ID = ss.SS_ID
left join client cl on job.client_ID = cl.client_ID
where jp.receivedDate between '$datefrom1' and '$dateto1'
and ssa.SSA_ID='$id'
group by jp.receivedDate
order by jp.receivedDate asc");
echo $final;
$query = mysql_query($final);
echo "<table>";
while($row = mysql_fetch_array($query))
{
$rDate = $row['rDate'];
$saFName = $row['saFName'];
$saLName = $row['saLName'];
$joNum = $row['joNum'];
$joType = $row['joType'];
$joTitle = $row['joTitle'];
$clientName = $row['clientName'];
$ssFName = $row['ssFName'];
$ssLName = $row['ssLName'];
$aDate = $row['aDate'];
$stat = $row['stat'];
echo "<tr>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$rDate."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$saFName."".$saLName."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$joNum."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$joType."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$joTitle."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$clientName."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$ssFName."".$ssLName."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$aDate."</td>";
echo "<td width='150' colspan=\"1\" align=\"center\">".$stat."</td>";
echo "</tr>";
}
echo "</table>";
}
?>
Thanks in advance for all the suggestions and help.

Answer 1

$_GET['id'] expected the get variable 'id' in the url (i.e. www.google.com?id=4 then $_GET['id'] would equal 4).
In order to avoid this you could do this before checking the get value if (! empty($_GET)) {$id = $_GET['id']}
EDIT: The actual error ended up being the assumption of needing to use $_GET instead of the possibility of $_POST for form data.

Answer 2

Looks like the select box is SSA_ID but you are using a $_GET['id'], try changing it to $_GET['SSA_ID'];