foreach for groups and subgroups in php - php

Question

i have table in database:
Group:
| id | Category | title |
| 1 | 1 | group1 |
| 2 | 2 | group2 |
| 3 | 1 | group3 |
| 4 | 3 | group4 |
| 5 | 2 | group5 |
| 6 | 1 | group6 |
News:
| id | Group | title | body |
| 1 | 3 | title1 | body1 |
| 2 | 2 | title2 | body2 |
| 3 | 1 | title3 | body3 |
| 4 | 4 | title4 | body4 |
| 5 | 1 | title5 | body5 |
| 6 | 5 | title6 | body6 |
| 7 | 3 | title7 | body7 |
| 8 | 2 | title8 | body8 |
| 9 | 1 | title9 | body9 |
| 10 | 6 | title10| body10 |
| 11 | 1 | title11| body11 |
| 12 | 5 | title12| body12 |
how can i show this as:
-GROUP1, GROUP3 and GROUP6
//GROUP1 (category1)
--title3
--title5
--title9
//GROUP3 (category1)
--title1
--title7
//GROUP6 (category1)
--title10
-GROUP2 and GROUP5
//GROUP2 (category2)
--title2
--title8
//GROUP5 (category2)
--title6
--titl12
-GROUP4
//GROUP4 (category3)
--title4
i will make this in foreach. thanks for help!

Answer 1

Your exact requested output makes this complicated.
$sql = 'SELECT n.title, n.Group AS group_id, g.Category AS cat_id
FROM News AS n
JOIN Group AS g ON g.id = group_id
ORDER BY cat_id, group_id, n.id';
$result = mysql_query($query);
$categories = array();
while ($row = mysql_fetch_assoc($result)) {
$catID = $row['cat_id'];
$groupID = $row['group_id'];
$title = $row['title'];
$categories[$catID]['groups'][$groupID]['titles'][] = $title;
}
foreach ($categories as $catID => $groups) {
$catGroups = '-GROUP'.implode(', GROUP',array_keys($groups)).PHP_EOL;
$lastComma = strrpos($catGroups,',');
if ($lastComma !== false) {
$catGroups = substr($catGroups,0,$lastComma-1).
' AND ' .substr($catGroups,$lastComma+1);
}
echo $catGroups;
foreach ($groups as $groupID => $titles) {
echo "//GROUP$groupID (category$catID)".PHP_EOL;
foreach ($groups as $group => $titles) {
echo '--'.$title.PHP_EOL;
}
}
}
If you didn't need such fancy output, this would be much simpler.
$sql = 'SELECT n.title, n.Group AS group_id, g.Category AS cat_id
FROM News AS n
JOIN Group AS g ON g.id = group_id
ORDER BY cat_id, group_id, n.id';
$result = mysql_query($query);
$lastCatID = null;
$lastGroupID = null;
while ($row = mysql_fetch_assoc($result)) {
$catID = $row['cat_id'];
$groupID = $row['group_id'];
$title = $row['title'];
if ($catID !== $lastCatID){
echo "*** CATEGORY $catID\n";
$lastCatID = $catID;
}
if ($groupID !== $lastGroupID){
echo "GROUP $groupID\n";
$lastGroupID = $groupID;
}
echo "-- $title\n";
}

Answer 2

You told, you have your values in the database. So you have to get them first, e.g. with the following database query:
SELECT
g.`title` AS `group_title`
, n.`title` AS `news_title`
FROM
`Group` AS g
INNER JOIN
`News` AS n
ON
g.`id` = n.`Group`
ORDER BY
g.`Category`
, n.`Group`
, n.`title`
Store the data in an array. Now you can use a foreach loop to iterate over the array.
===
Here my update:
First fill the array while reading from the database (example query see above).
<?php
$data = array();
$res = mysql_query('SELECT ...');
while (($row = mysql_fetch_assoc($res)) !== false) {
$data[$row['group_title']][] = $row['news_title'];
}
?>
Then write the array to the screen:
<?php
foreach ($data as $group_title => $groups) {
echo $group_title . "\n";
foreach ($groups as $news) {
echo "\t" . $news . "\n";
}
}
?>