i'm doing a voting system. After displaying all candidates from my DB, a user is to click on a candidate's image to vote.
I am trying to use GET to get the matric number of a candidate so as to echo a text.
The Error is this: Upon loading the page, an error message comes up even without clicking on any image as follows-

Notice: Undefined index: user in C:\xampp\htdocs\projects\onlinevoting\vote.php on line 74

Voted


What could be wrong?

if(isset($_POST['display']))
{

$position_selected=$_POST['position_selected'];
$sql="SELECT * FROM candidate WHERE position='$position_selected'";
$run_query=mysqli_query($db_conn,$sql);
if(mysqli_num_rows($run_query)>0){

$nr=mysqli_num_rows($run_query);
echo '<h3 style="font-size:2em;text-align:center">('.$nr.') ASPIRANTS FOR <span style="color:maroon;text-decoration:underline"> '.$position_selected.'</span></h3>';

while($row=mysqli_fetch_array($run_query)){
echo '<div class="asp">
<a class="votelink" href="?user='.$row["matno"].'"><img title="Click Image to Vote" height="300" width="300" src="data:image;base64,'.$row[6].' "></a><br><p style="font-weight:bolder;font-size:1.5em;width:300px;text-align:center;margin-bottom:0px;">'.$row[1].'<br><b><p style="font-size:1em;font-weight:bold;width:300px;text-align:center;margin-bottom:0px;">'.$row[2].'/'.$row[3].'</p><b><br>
</div>';

}

if ($_GET['user']==$row["matno"]){
echo 'Voted';
}


}

else
{
echo '<p style="color:darkred;font-weight:bolder;font-size:1.6em;text-align:center;">No candidate for this Position</p>';
}


}


?>

JoelAmawhe:

i'm doing a voting system. After displaying all candidates from my DB, a user is to click on a candidate's image to vote.
I am trying to use GET to get the matric number of a candidate so as to echo a text.
The Error is this: Upon loading the page, an error message comes up even without clicking on any image as follows-

Notice: Undefined index: user in C:\xampp\htdocs\projects\onlinevoting\vote.php on line 74

Voted


What could be wrong?

if(isset($_POST['display']))
{

$position_selected=$_POST['position_selected'];
$sql="SELECT * FROM candidate WHERE position='$position_selected'";
$run_query=mysqli_query($db_conn,$sql);
if(mysqli_num_rows($run_query)>0){

$nr=mysqli_num_rows($run_query);
echo '<h3 style="font-size:2em;text-align:center">('.$nr.') ASPIRANTS FOR <span style="color:maroon;text-decoration:underline"> '.$position_selected.'</span></h3>';

while($row=mysqli_fetch_array($run_query)){
echo '<div class="asp">
<a class="votelink" href="?user='.$row["matno"].'"><img title="Click Image to Vote" height="300" width="300" src="data:image;base64,'.$row[6].' "></a><br><p style="font-weight:bolder;font-size:1.5em;width:300px;text-align:center;margin-bottom:0px;">'.$row[1].'<br><b><p style="font-size:1em;font-weight:bold;width:300px;text-align:center;margin-bottom:0px;">'.$row[2].'/'.$row[3].'</p><b><br>
</div>';

}

if ($_GET['user']==$row["matno"]){
echo 'Voted';
}


}

else
{
echo '<p style="color:darkred;font-weight:bolder;font-size:1.6em;text-align:center;">No candidate for this Position</p>';
}


}


?>

Change these lines:
if ($_GET['user']==$row["matno"]){
echo 'Voted';
}

To:
if (isset($_GET['user'])) {
if ($_GET['user']==$row["matno"]){
echo 'Voted';
}
}