PHP deleting from database not working - php

Question

I'm trying to let the user check off which item to be deleted. When the user check off one or many items and click the Delete button, those data will be erased from the database. I've also added a search box to search for the dvd. The search box works, but the deleting doesn't. This is what it looks like in the browser.
My PHP looks like this (I took out the searching code):
<form action="" method="post">
<p><input type="text" name="search"> <input type="submit" value="Search"></p>
<p><input type="submit" name="deleting" value="Delete"></p>
</form>
<?php
$link = mysqli_connect( $host, $user, $password, $dbname);
if (!$link) {
die('Could not connect: ' . mysqli_connect_error());
}
echo 'Connected successfully<br/>';
//searching code goes here
if (isset ($_POST['deleting']) && isset ($_POST['deleteThese']) )
{
$deleteThese = implode(",", $_POST['deleteThese']);
$queryTwo = "DELETE FROM `$dbname`.`dvds` WHERE `dvds`.`DvdID` IN ($deleteThese)";
$resultTwo = mysqli_query($link, $queryTwo);
}
echo "<table border=\"1\"><tr><th>DvdTitle</th><th>RunningTime</th><th>Delete</th></tr>";
if (mysqli_num_rows($result) == 0)
echo "<tr><td colspan='2'>No records found.</td></tr>";
else {
while ($row = mysqli_fetch_assoc($result)) {
echo "<tr><td>" . $row['DvdTitle'] . "</td>";
echo "<td>" . $row['RunningTime'] . "</td>";
echo "<td>" . "<form>" . "<input type='checkbox' name='deleteThese[]' value='" . $row['DvdID'] . "' >" . "</form>" . "</td></tr>\n";
}
}
echo "</table>";
mysqli_free_result($result);
mysqli_close($link);
?>
Each DvdTitle has an unique Dvd ID, hence the value of each row is the dvd's ID $row['DvdID'].

Answer 1

Adding the parentheses will allow for those ID's to be selected for deletion.
IN($deleteThese)
EDIT
Do not close the form after the submit button. Put that at the end of the code. This will allow the form to include the checkbox values.
<form action="" method="post">
<p><input type="text" name="search"> <input type="submit" value="Search"></p>
<!-- YOUR PHP CODE -->
<p><input type="submit" name="deleting" value="Delete"></p>
</form>
2nd Edit [requested to improve code]
Move the isset on top of the form.
<?php
if (isset ($_POST['deleting']) && isset ($_POST['deleteThese']) )
{
$deleteThese = implode(",", $_POST['deleteThese']);
$queryTwo = "DELETE FROM `$dbname`.`dvds` WHERE `dvds`.`DvdID` IN ($deleteThese)";
$resultTwo = mysqli_query($link, $queryTwo);
}
?>
<form>....

Answer 2

$deletethese might need to have quotes around it.