advice on php post operation not running - php

Question

I have donation page which when the user clicks donate it posts the data to a php file named test.php I am trying this out my first trying to echo the first name and last name but this is not working ultimately I want this php page to run a MySQL query to update the total_Donation row within a database, here is my main php page first.
Database code which sits at top of file
<?php
$con = mysql_connect("localhost","root","null");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("snr", $con);
$names_sql = "SELECT first_Name, last_Name FROM donate WHERE user_ID > 0";
$names_query = mysql_query($names_sql)or die(mysql_error());
$rsNames= mysql_fetch_assoc($names_query);
if(isset($_POST['donation']) && $_POST['donation'] != '')
{
$donation = mysql_real_escape_string($_GET['donation']);
$fname = mysql_real_escape_string($_GET['first_Name']);
$lname = mysql_real_escape_string($_GET['last_Name']);
$donate_sql = "UPDATE `donate` SET donate_Total = donate_Total + '{$donation}' WHERE first_Name = '{$fname}' AND last_Name = '{$lname}'";
}
mysql_close($con);
?>
Here is my form section of html
form method ="post" action="test.php">
<table>
<tr><td><label>Runner:</label></td>
<td>
<select>
<?php do{?>
<option> <?php echo $rsNames['first_Name'];?> <?php echo $rsNames['last_Name'];?></option>
<?php } while ( $rsNames= mysql_fetch_assoc($names_query))?>
</select>
</td>
</tr>
<tr><td><label>Donation £</label></td><td><input type="text" maxlength="9" value="0.00" name="donation"/></td></tr>
<tr><td><input id="submit" type="submit" value="DONATE"/></td></tr>
</table>
</form>
the option gets all the first names and last names fine when the user hits donate I want it to run the $donation_sql but all i get are errors saying unidentified index, I'm even trying the below in the test.php to simply just echo the first_Name this is giving the same error.
<?php
echo $_POST['first_Name'];
?>
Can someone please help me with this, thanks.

Answer 1

index.php
<?php
$con = mysql_connect("localhost","root","null");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("snr", $con);
$names_sql = "SELECT first_Name, last_Name FROM donate WHERE user_ID > 0";
$names_query = mysql_query($names_sql)or die(mysql_error());
?>
<form method ="post" action="test.php">
<table>
<tr><td><label>Runner:</label></td>
<td>
<select name="name">
<?php
while($list = mysql_fetch_array($names_query))
{
?>
<option value="<?php echo $list['first_Name'] . ' ' . $list['last_Name']; ?>">
<?php echo $list['first_Name'] . ' ' . $list['last_Name']; ?>
</option>
<?php
}
?>
</select>
</td>
</tr>
<tr><td><label>Donation £</label></td><td><input type="text" maxlength="9" value="0.00" name="donation" /></td></tr>
<tr><td><input id="submit" type="submit" name="send" value="DONATE"/></td></tr>
</table>
</form>
test.php
<?php
$con = mysql_connect("localhost","root","null");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("snr", $con);
if(isset($_POST['donation']) && $_POST['donation'] != '')
{
$names = explode(' ',$_POST['name']);
$first_name= $names[0];
$last_name= $names[1];
$donation = mysql_real_escape_string($_POST['donation']);
$fname = mysql_real_escape_string($first_name);
$lname = mysql_real_escape_string($last_name);
$donate_sql = "UPDATE `donate` SET donate_Total = donate_Total + '" .$donation. "' WHERE first_Name = '" .$fname. "' AND last_Name = '" .$lname. "'";
echo 'DEBUG (remove after OK): <br>' .$donate_sql. '<br>';
$res = mysql_query($donate_sql);
echo 'Thanks ' .$first_name. ' ' .$last_name. '<br>';
}
mysql_close($con);
?>
That´s it!

Answer 2

\make sure you set name for select and you have valua attr in option tag
<select name="first_Name">
<otpion value="<?php echo $rsNames['first_Name'];?>"><?php echo $rsNames['first_Name'];?>
<?php echo $rsNames['last_Name'];?>
</option>
</select>

Answer 3

YOu need to give a name attribute to the select:
<select name="first_Name">
<?php while ( $rsNames= mysql_fetch_assoc($names_query)):?>
<option value="<?php echo htmlspecialchars($rsNames['first_Name']).' '.htmlspecialchars($rsNames['last_Name']);?>"> [option displayed to the user here]</option>
<?php endwhile;?>
</select>
And of course use the $_POST array, not the $_GET, since you're using the POST method.