Display data once if same - php

Question

With this code:
$query = "select users.id_user, users.full_name, users.rights, users.group, group.id, group.name
from users
inner join group
on users.group=group.id
where users.rights= 2";
// connection code
while ($re = mysql_fetch_array($res))
{
$id_user = $re["id_user"];
$id_group = $re["id"];
$full_name= $re["full_name"];
$group_name= $re["name"];
echo "<div>";
echo "<p><strong>$group_name</strong></p>";
echo "$full_name<br />";
echo "</div>";
}
?>
I get this:
Group1
User1
Group1
User2
Group2
User3
Group2
User4
and I need it like this:
Group1
User1
User2
Group2
User3
User4
How to show group name just once?

Answer 1

Tweak your query that you use the database power to give you the information you need.
select
usergroup.name
, GROUP_CONCAT(user.name SEPARATOR '<br />') 'users'
from
user
inner join
usergroup
on
user.usergroup_id = usergroup.id
where
user.rights = 2
group by
usergroup.id
see demo http://sqlfiddle.com/#!2/0d104/1 in your php you can use $row['users']

Answer 2

You may use associative arrays for this task. For example, make an array $groups, and in your while loop do something like
$groups[$re["name"]]["full_name"][] = $re["full_name"];
Then, when you display your html loop through $groups and inside it loop though full names.

Answer 3

This is what I came up with:
$query = "SELECT users.id_user, users.full_name, users.rights, users.group, group.id, group.name
FROM users
INNER JOIN group
ON users.group=group.id
WHERE users.rights=2
ORDER BY group.name ASC";
// connection code
$group_name = '';
while ($re = mysql_fetch_array($res))
{
if( $group_name === '' )
{
$group_name = $re["name"];
echo "<div>";
echo "<p><strong>$group_name</strong></p>";
}
elseif( $group_name !== $re["name"] )
{
$group_name = $re["name"];
echo "</div>";
echo "<div>";
echo "<p><strong>$group_name</strong></p>";
}
$id_user = $re["id_user"];
$id_group = $re["id"];
$full_name= $re["full_name"];
echo "$full_name<br />";
}
?>
It's basically ordering the result by the group names, and while it iterates, the group name is being checked. If it's the same, only the name is printed, if it differs, the div is closed, a new one is made and the new group title is echoed.