從這個表：從這個表我在 PHP 中得到這個數組： PHP 中的數組我想在這個數組中添加一個新行，我知道category_id和parent_id，如何對id_path和level進行編程？編輯1：例如最后一行：category_id：107，parent_id：106，如何編碼id_path = 96/106/107和級別？id_path：由斜杠分隔的類別 ID 序列編輯2： function test() { $arGiven = [ [ 'category_id' => 100, 'parent_id' => 107, 'id_path' => '', 'level' => 0, ], [ 'category_id' => 106, 'parent_id' => 96, 'id_path' => '', 'level' => 0, ], [ 'category_id' => 107, 'parent_id' => 106, 'id_path' => '', 'level' => 0, ] ]; $arExpected = [ [ 'category_id' => 100, 'parent_id' => 107, 'id_path' => '96/106/107/100', 'level' => 4, ], [ 'category_id' => 106, 'parent_id' => 96, 'id_path' => '96/106', 'level' => 2, ], [ 'category_id' => 107, 'parent_id' => 106, 'id_path' => '96/106/107', 'level' => 3, ] ]; $result = $arGiven; return $result; }但 $newArray 是[ "/107", "/107/96", "/107/96/106"]代替：[ '96/106/107/100', '96/106', '96/106/107']
1 回答
MYYA
TA貢獻1868條經驗 獲得超4個贊
我確信它可以真正優化：
<?php
$arGiven = [
// add the root category
[
'category_id' => 96,
'parent_id' => 0,
'id_path' => '',
'level' => 0,
],
[
'category_id' => 100,
'parent_id' => 107,
'id_path' => '',
'level' => 0,
],
[
'category_id' => 106,
'parent_id' => 96,
'id_path' => '',
'level' => 0,
],
[
'category_id' => 107,
'parent_id' => 106,
'id_path' => '',
'level' => 0,
]
];
$level = 0;
$parentLevelIds = [0];
do {
$level++;
$nextParentLevelIds = [];
$arGiven = array_map(function($value) use($level, $parentLevelIds, &$nextParentLevelIds, $arGiven) {
if (in_array($value['parent_id'], $parentLevelIds)) {
$path = '';
if ($value['parent_id'] !== 0) {
$parent = array_filter($arGiven, function($parentSearchValue) use ($value) {
return $parentSearchValue['category_id'] == $value['parent_id'];
});
if (!empty($parent)) {
$path = array_shift($parent)['id_path'];
}
}
$value['level'] = $level;
$value['id_path'] = empty($path) ? $value['category_id'] : ( $path . '/' . $value['category_id'] );
$nextParentLevelIds[] = $value['category_id'];
}
return $value;
}, $arGiven);
$parentLevelIds = $nextParentLevelIds;
$hasLevel0 = !empty(array_filter($arGiven, function($value) {
return $value['level'] == 0;
}));
} while ($hasLevel0);
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