Getting the value from ($_GET["Value"]) - php

Question

// PAGE ONE
This is the index page, Here I am printing out rows from a list of
movie´s with some basic info, title , year.
I am also adding edit and delete links to the movies,
these work by passing the row id's of that movie.
$sql = "SELECT c.* , d.* FROM category c , movies d WHERE c.ID=d.ID";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
echo "<div class='floatbox collection'><table><tr><th>Titel</th><th>regissör</th><th>År</th><th>Genre</th><th>Ändra</th><th>Ta bort</th>";
while($row = $result->fetch_assoc()) {
echo
"<tr><td>".$row["title"]."</td><td>".$row["director"]."</td><td>"
.$row["year"]."</td><td>".$row["category"]."</td>
<td><a href='edit.php?row=".$row["ID"]."'>justera</a></td>
// delete link to send ID to next page
<td><a href='delete.php?delete=".$row["ID"]."'>stryk</a></td>";
}
echo "</table></div>";
} else {
echo "0 results";
}
// PAGE TWO
Here I have my $row[ID] trough $_get by the link on the previous page,
I have checked the value by "dumping" so I know that the row ID is in that
variable: The thing is, How do I call that $ID in my sql statement?
I'm trying to delete by calling that ID on the table row.
// Variable with correct ID value
if(isset($_GET["ID"]))
if($_GET["ID"]) = $ID; // This doesn't work, Do I need to convert
the $get_ID to a variable with the ID that can be called in the statement?
or is my syntax wrong?
// Delete join
$sql = "SELECT * FROM movies, category
INNER JOIN category ON movies.ID = category.ID
DELETE WHERE movies.ID = '$ID'"; // No syntax works here
// Any help appreciated.
// konfirmering
if ($conn->query($sql) === TRUE) {
echo "Register struket <br>
<a href='panel.php'>Gå tillbaka</a>";
} else {
echo "Fel vid anslutning : " . $conn->error;
}

Answer 1

As per your code your delete.php would be like this:
// Variable with correct ID value
if (isset($_GET["delete"])) {
$ID = $_GET["delete"];
// Delete join
$sql = "DELETE FROM movies, category INNER JOIN category ON movies.ID = category.ID WHERE movies.ID = '$ID'";
// konfirmering
if ($conn->query($sql) === TRUE) {
echo "Register struket <br><a href='panel.php'>Gå tillbaka</a>";
} else {
echo "Fel vid anslutning : " . $conn->error;
}
}