Delete data from mysql database php - php

Question

Firstly i'm not a developer so bear with me :)
I'm trying to delete a row from a small inventory system we are setting up but its still not allowing me to do anything, this is my current code:
Assigned page:
<?php
$password = 'notTheRealPassword';
$conn = mysql_connect('localhost', 'root', $password);
if(!$conn)
{
die('Error connecting database');
}
mysql_select_db('inventory_system', $conn);
$query= "SELECT * from assigned";
$result=mysql_query($query);
echo "<table border='0' cellpadding='100' class='table-striped'>";
echo "<th>Asset ID</th><th>Asset</th><th>Type</th><th>Manufacturer</th><th>Model</th><th>PC
Name</th><th>Serial Number</th><th>Purchased</th><th>Warranty
End</th><th>OS</th><th>OS
Bit</th><th>CPU</th><th>Memory</th><th>HDD</th><$
while($row = mysql_fetch_array($result))
{
echo '<td>' . $row['asset_id'] . '</td>';
echo '<td>' . $row['asset'] . '</td>';
echo '<td>' . $row['type'] . '</td>';
echo '<td>' . $row['manufacturer'] . '</td>';
echo '<td>' . $row['model'] . '</td>';
echo '<td>' . $row['pc_name'] . '</td>';
echo '<td>' . $row['serial_no'] . '</td>';
echo '<td>' . $row['purchased'] . '</td>';
echo '<td>' . $row['warranty_end'] . '</td>';
echo '<td>' . $row['os'] . '</td>';
echo '<td>' . $row['os_bit'] . '</td>';
echo '<td>' . $row['cpu'] . '</td>';
echo '<td>' . $row['memory'] . '</td>';
echo '<td>' . $row['hdd'] . '</td>';
echo '<td>' . $row['plant'] . '</td>';
echo '<td>' . $row['location'] . '</td>';
echo '<td>' . $row['username'] . '</td>';
echo "<td>Delete</td>";
echo "</tr>";
}
echo "</table>";
mysql_close();
?>
Delete page:
<?php
$password = 'notTheRealPassword';
$conn = mysql_connect('localhost', 'root', $password);
if(!$conn)
{
die('Error connecting database');
}
mysql_select_db('inventory_system', $conn);
$id = (int)$_GET['asset_id'];
mysqli_query($conn,"DELETE FROM assigned WHERE asset_id='".$id."'");
mysqli_close($conn);
header("Location: assigned1.php");
?>
I'm guessing it will be something simple.
Cheers,

Answer 1

There are a few things wrong here:
Your GET variable, the one you put in the link, is id, not asset_id
You should not use GET to modify things in your database; if your browser or a plugin decides to pre-fetch links, your database will be wiped out.
You can't mix mysql apis, use either mysqli or mysql (although not the latter...).
The mysql_* functions are deprecated, you should use PDO or mysqli in combination with prepared statements.
When you echo out lots of html, it is easier to just close the php section and then open it again when you need it; now you have php tags inside the echoed texts. The php / strings / html are not separated correctly.