How to find a key in multidimensional array? - php

Question

I have a multidimensional array and i need make a searchCategory($categories, $id) function, which have to return a value of 'title' properties.
it try this code, it work but only for one layer of multidimensional array.
Multidimensional array:
$categories = array( array(
"id" => 1,
"title" => "Обувь",
'children' => array(
array(
'id' => 2,
'title' => 'Ботинки',
'children' => array(
array('id' => 3, 'title' => 'Кожа'),
array('id' => 4, 'title' => 'Текстиль'),
),
),
array('id' => 5, 'title' => 'Кроссовки',),
)), array(
"id" => 6,
"title" => "Спорт",
'children' => array(
array(
'id' => 7,
'title' => 'Мячи'
)
) ), );
Code which i try solve problem:
function searchCategory($categories, $id) {
foreach($categories as $category) {
if($category['id'] == $id) {
echo $category['title'] . '<br>';
}
}
};
I need my function to look up the id value in all arrays and return the title in the case of the array found

Answer 1

Here is recursive iterator case for you, please go through inline doc for explanation
function searchCategory($categories, $id)
{
$arrayiter = new RecursiveArrayIterator($categories);
$iteriter = new RecursiveIteratorIterator($arrayiter);
foreach ($iteriter as $key => $value) {
// checking if iterator comes to point where key is id and value matched
if ($key == 'id' && $value == $id) {
// returning matched value with current iterator instance
return $iteriter->getInnerIterator()['title'];
}
}
return '';
}
echo searchCategory($categories, 2).'<br/>';
echo searchCategory($categories, 7);
Working demo.
RecursiveArrayIterator - This iterator allows to unset and modify values and keys while iterating over Arrays and Objects in the same way as the ArrayIterator. Additionally it is possible to iterate over the current iterator entry.
RecursiveIteratorIterator - Can be used to iterate through recursive iterators.
RecursiveIteratorIterator::getInnerIterator: Get inner iterator

Answer 2

you need to make your function recursively
Demo : https://3v4l.org/CR7CD
function searchCategory($categories, $id) {
foreach($categories as $category) {
if($category['id'] == $id)
echo $category['title'] . '<br>';
if(isset($category['children']))
searchCategory($category['children'],$id);
}
}