Module 'memcache' already loaded on hosting?

Question

Yii

The site throws out this message when visiting one of the pages. Before that everything was ok.
After deleting the cache in runtime / cache - the page is loaded for the first time, and this message pops up the second time. Should I kick the hoster or is it a problem on my part?

Answer 1

Hoster probably, I got this after updating php. For some reason, it stuck the module twice.

Answer 2

In short:
- you start to form a tree from parents
- at each iteration you check if there are children with parent_id = parent ID
- you repeat until you run out of descendants The
easiest way is to implement recursion, here is an example

<?php

$items = [
    ['ID'=>35, 'menu_item_parent'=>0],
        ['ID'=>38, 'menu_item_parent'=>35],
        ['ID'=>36, 'menu_item_parent'=>35],
            ['ID'=>39, 'menu_item_parent'=>36],
                ['ID'=>40, 'menu_item_parent'=>39],
                ['ID'=>41, 'menu_item_parent'=>39],
    ['ID'=>37, 'menu_item_parent'=>0],
];

function find_childrens($items, $parentItem) {
    $ret = [];
    foreach($items as $item) {
        if ($item['menu_item_parent'] == $parentItem['ID']) {
            $treeItem = $item;
            $treeItem['subitems'] = find_childrens($items, $item);
            $ret[] = $treeItem;
        }
    }
    return $ret;
}

$tree = [];

foreach($items as $item) {
    if ($item['menu_item_parent'] == 0) {
        $treeItem = $item;
        $treeItem['subitems'] = find_childrens($items, $item);
        $tree[] = $treeItem; 
    }
}

echo '<pre>';
print_r($tree);
echo '</pre>';
echo '<hr>';

function printer($treeItem, $level) {
    if ($level) echo str_repeat('--', $level);
    echo $treeItem['ID'].'<br>';
    if ($treeItem['subitems']) {
        foreach($treeItem['subitems'] as $subItem) {
            printer($subItem, $level+1);
        }
    }
}

foreach($tree as $treeItem) printer($treeItem, 0);

result

Array
(
    [0] => Array
        (
            [ID] => 35
            [menu_item_parent] => 0
            [subitems] => Array
                (
                    [0] => Array
                        (
                            [ID] => 38
                            [menu_item_parent] => 35
                            [subitems] => Array
                                (
                                )

                        )

                    [1] => Array
                        (
                            [ID] => 36
                            [menu_item_parent] => 35
                            [subitems] => Array
                                (
                                    [0] => Array
                                        (
                                            [ID] => 39
                                            [menu_item_parent] => 36
                                            [subitems] => Array
                                                (
                                                    [0] => Array
                                                        (
                                                            [ID] => 40
                                                            [menu_item_parent] => 39
                                                            [subitems] => Array
                                                                (
                                                                )

                                                        )

                                                    [1] => Array
                                                        (
                                                            [ID] => 41
                                                            [menu_item_parent] => 39
                                                            [subitems] => Array
                                                                (
                                                                )

                                                        )

                                                )

                                        )

                                )

                        )

                )

        )

    [1] => Array
        (
            [ID] => 37
            [menu_item_parent] => 0
            [subitems] => Array
                (
                )

        )

)
====================================================
35
-- 38
-- 36
---- 39
------ 40
------ 41
37