Update record then delete - php

Question

I'm trying to update one record and then delete another in one go, however it's only allowing me to do one or the other;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";
How do I get it to do both?
I have tried the following;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update = "DELETE FROM playeritems WHERE id = '$realid'";
__
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user' DELETE FROM playeritems WHERE id = '$realid'";
__
FULL CODE:
if ($_SERVER['REQUEST_METHOD'] = $_POST AND isset($_POST['sell'])) {
$sql = "SELECT felcredits FROM user WHERE username = '$user'";
$result = $db_conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$felcredits = $row['felcredits'];
}
}
$value = $felcredits + $value;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";
if ($db_conn->query($update) === TRUE) {
echo "<br />Details Updated";
} else {
echo "Error: " . $insert . "<br>" . $db_conn->error;
}
}

Answer 1

The problem is here:
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update = "DELETE FROM playeritems WHERE id = '$realid'";
your second sql query will override the first one, so make separate query like:
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
mysqli_query($conn, $update);
$delete = "DELETE FROM playeritems WHERE id = '$realid'";
mysqli_query($conn, $delete);
where $conn is the connection handle

Answer 2

You Try change in Your full code Like this
in your Execute code
if ($_SERVER['REQUEST_METHOD'] = $_POST AND isset($_POST['sell'])) {
$sql = "SELECT felcredits FROM user WHERE username = '$user'";
$result = $db_conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$felcredits = $row['felcredits'];
}
}
$value = $felcredits + $value;
$update = "UPDATE user SET felcredits = '$value' WHERE username = '$user'";
$update2 = "DELETE FROM playeritems WHERE id = '$realid'";
if (($db_conn->query($update) === TRUE) && ($db_conn->query($update2) === TRUE)) {
echo "<br />Details Updated";
} else {
echo "Error: " . $insert . "<br>" . $db_conn->error;
}
}