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@ 2019-05-29T09:37:01Z

<?php
$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'
        )
    )   ), );

    function searchCategory($categories, $id) {
        foreach($categories as $category) {
            if($category['id'] == $id)
                echo $category['title'] . '<br>';
            if(isset($category['children']))
                searchCategory($category['children'],$id);
        } 
    };

    searchCategory($categories,4);

Output for git.master, git.master_jit, rfc.property-hooks: Текстиль<br>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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