php transform array into multidim array - php

Question

So I'm working on a website with Doctrine as ORM and I get the following array back as a result:
Array (
[0] => Array (
[c_cat_id] => 1
[c_title] => Programas e projetos
[p_menu] => PBA BR 163
[p_page_id] => 1
)
[1] => Array (
[c_cat_id] => 1
[c_title] => Programas e projetos
[p_menu] => Outros projetos
[p_page_id] => 3
)
)
Is it possible to transform this array (in PHP) to something like this:
Array (
[0] => Array (
[c_cat_id] => 1
[c_title] => Programas e projetos
[pages] => Array (
[0] => Array (
[p_page_id] => 1
[p_menu] => PBA BR 163
)
[1] => Array (
[p_page_id] => 3
[p_menu] => Outros projetos
)
)
)
)
Thanks for your help, always eager to learn new ways of doing things and that's why I love StackOverflow ;)

Answer 1

Tested and working:
Code:
$original = array(
array(
"c_cat_id" => "1",
"c_title" => "Programas e projetos",
"p_menu" => "PBA BR 163",
"p_page_id" => "1"),
array(
"c_cat_id" => "1",
"c_title" => "Programas e projetos",
"p_menu" => "Outros projetos",
"p_page_id" => "3"),
array(
"c_cat_id" => "2",
"c_title" => "Another Cat",
"p_menu" => "Outros projetos",
"p_page_id" => "4"),
);
$result = array();
foreach ($original as $row) {
$cat = $row['c_cat_id'];
if (!isset($result[$cat])) {
$result[$row['c_cat_id']] = array(
'c_cat_id'=>$row['c_cat_id'],
'c_title'=>$row['c_title'],
'pages'=>array(),
);
}
unset($row['c_cat_id'],$row['c_title']);
$result[$cat]['pages'][] = $row;
}
var_dump($result);
Result:
array(2) {
[1]=>
array(3) {
["c_cat_id"]=>
string(1) "1"
["c_title"]=>
string(20) "Programas e projetos"
["pages"]=>
array(2) {
[0]=>
array(2) {
["p_menu"]=>
string(10) "PBA BR 163"
["p_page_id"]=>
string(1) "1"
}
[1]=>
array(2) {
["p_menu"]=>
string(15) "Outros projetos"
["p_page_id"]=>
string(1) "3"
}
}
}
[2]=>
array(3) {
["c_cat_id"]=>
string(1) "2"
["c_title"]=>
string(11) "Another Cat"
["pages"]=>
array(1) {
[0]=>
array(2) {
["p_menu"]=>
string(15) "Outros projetos"
["p_page_id"]=>
string(1) "4"
}
}
}
}

Answer 2

It looks like you want to take an Array of pages and turn it into an array of categories with each containing an array of pages.
$inputArray = array(...); // whatever you have originally
$catArray = array();
foreach($inputArray as $page) {
addToCatArray($page);
}
function addToCatArray($page) {
$found = false;
foreach($catArray as $cat) {
if ($cat['c_cat_id'] == $page['c_cat_id'] {
$newPage = array('p_page_id' => $page['p_page_id'], 'p_menu' => $page['p_menu']);
$cat['pages'][] = $newPage;
$found = true;
break;
}
}
if (!$found) { // create a new category
$newCat = array('c_cat_id' => $page['c_cat_id'], 'c_title' => $page['c_title']);
$newPage = array('p_page_id' => $page['p_page_id'], 'p_menu' => $page['p_menu']);
$newCat['pages'] = array($newPage);
$catArray[] = $newCat;
}
}