running multiple query's in mysql? - php

Question

i'm currently running this query to delete messages within a messaging system on my site, when the user hits delete the query runs and updates the table in my database.
deleted_to is updated from '0' to '1'
what i also want to do is capture the user's id and store this in the table under the column 'user_who_deleted'
to do this i am using $_SESSION['user_id'] but am having trouble finding a way to have this inserted into the table.
can someone please show me how to do this. thanks
delete message link code:
<?php $inbox_set = get_inbox();
while ($inbox = mysql_fetch_array($inbox_set)) { ?>
<div class="message_buttons2">Delete Conversation</div>
query that sets deleted_to from 0 to 1 :
function delete_message_to($message, $user) {
global $connection;
global $_SESSION;
$query = "UPDATE ptb_messages
SET deleted_to='1'
WHERE msg_id='1' ";
mysql_query($query, $connection);
}
the delete bit works but i am now trying to insert the users $_SESSION['user_id'] into ptb_messages.user_who_deleted
i want this to run as part of the same query if i can. i've tried something like below but it doesnt do anything
function delete_message_next($message, $user) {
global $connection;
global $_SESSION;
$query = "SELECT user_who_deleted
FROM ptb_messages
SET user_who_deleted =" . $_SESSION['user_id'] . "";
mysql_query($query, $connection);
}

Answer 1

Unless i misunderstand, don't you just want to do this?
$query = '
UPDATE
ptb_messages
SET
deleted_to=1,
user_who_deleted = "'.$_SESSION['user_id'].'"
WHERE
msg_id=1';
Ideally, as mentioned, you want to go to mysqli or PDO, and work with prepared statements:
$query = '
UPDATE
ptb_messages
SET
deleted_to= :setDeleted,
user_who_deleted = :userId
WHERE
msg_id= :msgId';
$stmt = $dbh->prepare($query);
$stmt->bindParam(':setDeleted', 1);
$stmt->bindParam(':userId', $_SESSION['user_id']);
$stmt->bindParam(':msgId', 1);
$stmt->execute();
http://www.php.net/pdo.prepared-statements