Php While loop only displaying one record - php

Question

I am trying to go through each record in my db and update the row. It works, but only one at a time.
$con = mysql_connect('localhost', 'root', 'root');
mysql_select_db('webinar', $con);
$result = mysql_query("SELECT * FROM register WHERE mon=0 AND 1hour=0 AND 10min=0 AND wed=0 AND complete=0");
while ($row = mysql_fetch_assoc($result)) {
echo $row['email'];
$res = "UPDATE register SET mon=1 WHERE id=".$row['id']."";
$result = mysql_query($res);
}

Answer 1

Just run
UPDATE register SET mon=1 WHERE mon=0 AND 1hour=0 AND 10min=0 AND wed=0 AND complete=0
Example:
$result = mysql_query("SELECT id, email FROM register WHERE mon=0 AND 1hour=0 AND 10min=0 AND wed=0 AND complete=0");
while ($row = mysql_fetch_assoc($result)) {
echo $row['email'];
}
// now update!
$result = mysql_query("UPDATE register SET mon=1 WHERE mon=0 AND 1hour=0 AND 10min=0 AND wed=0 AND complete=0");