Delete MySQL Database selection from dropdown menu in PHP - php

Question

I'm currently working on a knowledge base for articles for our schools info center. Currently I'm making a page for moderators to delete articles. The page grabs all data from the "articles" table in the database to display it in a dropdown menu. The user can then select whichever and press delete. Which I intend to have said button take the selected ID and remove it from the database. However it will not delete.
Code:
<?php
session_start();
echo 'Select an article to delete, '.$_SESSION['username']. '<br>';
include 'index.php';
{
if(isset($_POST['Delete'])){
$delete = 'DELETE FROM articles WHERE articleID IN (' . implode(',', $_POST['articles']) . ')';
if(mysqli_query($link, $delete))
{
echo '<script language="javascript">';
echo 'alert("Article was deleted!")';
echo '</script>';
}
else
{
echo 'ERROR: Could not delete article';
}
}
}
?>
<form method="post" action="deleteArticles.php">
<select name="articles" multiple="multiple">
<?php
$sql=mysqli_query($link,"SELECT * FROM articles ORDER BY title");
while ($row = mysqli_fetch_assoc($sql))
{
echo '<option value="' . $row['articleID'] . '">' . $row['title'] . '</option>';
}
?>
</select>
<input type="submit" value="Delete" name="Delete" />
</form>

Answer 1

You missed to close your open select tag. You also didn't add multiple attribute to allow multiple selection.
<select name="articles" multiple="multiple">
<?php
$sql=mysqli_query($link,"SELECT * FROM articles ORDER BY title");
while ($row = mysqli_fetch_assoc($sql))
{
echo '<option value="' . $row['articleID'] . '">' . $row['title'] . '</option>';
}
?>
</select>
Uneeded {} wrapping removed.
And this:
<?php
session_start();
echo 'Select an article to delete, '.$_SESSION['username']. '<br>';
include 'index.php';
{
if(isset($_POST['Delete'])){
$delete = 'DELETE FROM articles WHERE articleID IN (' . implode(',', $_POST['articles']) . ')';
if(mysqli_query($link, $delete))
{
echo '<script language="javascript">';
echo 'alert("Article was deleted!")';
echo '</script>';
}
else
{
echo 'ERROR: Could not delete article';
}
}
}
?>
To:
<?php
session_start();
echo 'Select an article to delete, '.$_SESSION['username']. '<br>';
include 'index.php';
if(isset($_POST['Delete'])){
$delete = 'DELETE FROM articles WHERE articleID IN (' . implode(',', $_POST['articles']) . ')';
if(mysqli_query($link, $delete))
{
echo '<script language="javascript">';
echo 'alert("Article was deleted!")';
echo '</script>';
}
else
{
echo 'ERROR: Could not delete article';
}
}
?>
Since it is multiple selection, change select name to articles[]
Like:
<select name="articles[]" multiple="multiple">