Question

我如何创建在多维嵌套数组中搜索的搜索功能？

给出以下数组：

我如何使用在“绘画”中搜索的键来过滤此数组？

例如，搜索键为“ sun”

结果应如下所示：

Array
(

[2] => Array
    (
        [id] => 3
        [parent_name] => ART
        [children] => Array
            (
                [0] => Array
                    (
                        [post_id] => 100
                        [child_name] => Bookeeping
                        [painting] => Array
                            (
                                [2] => sunrise
                            )

                    )

                [1] => Array
                    (
                        [post_id] => 101
                        [child_name] => Addiction
                        [painting] => Array
                            (
                                [0] => sunrise
                            )

                    )

            )

    )
[3] => Array
    (
        [id] => 4
        [parent_name] => Music
        [children] => Array
            (
                [0] => Array
                    (
                        [post_id] => 102
                        [child_name] => POP
                        [painting] => Array
                            (
                                [0] => suntown
                            )

                    )

                [1] => Array
                    (
                        [post_id] => 103
                        [child_name] => Rock
                        [painting] => Array
                            (
                                [0] => sunrisenew
                            )

                    )

            )

    )
)

Answer 1

$needle = "sun";
$filteredArr = array_filter(
    $arr,
    function($v) use ($needle) {
        foreach($v['children'] as $child) {
            // "Version 1" of filtering, no "parts of strings" searches
            if (in_array($needle, $child['painting'])) {
                return true;
            }

            // "Version 2" of filtering, keyword may be part of a painting string
            foreach($child['painting'] as $painting) {
                if (strpos($painting, $needle) !== false) {
                    return true;
                }
            }
        }

        return false;
    }
);

如果对array_filter（）使用回调，则可以进行相当高级的过滤。

修改新版本的答案可以删除绘画阵列中与模式不匹配的条目。

这是通过执行嵌套的foreach循环来完成的，一直循环到所需的最里面的数组，在这种情况下为 painting 。过滤 painting 数组，以便删除其中的所有不匹配元素。完成此操作后，在下一个向外的级别检查 painting 数组，如果为空，则清除类型为“向外传播”。这样，只有带有匹配绘画条目的条目才应保留，并且应该具有可扩展性。

这些引用不是严格必需的，可以将数组键变量添加到foreach循环中。但是我不喜欢造成这种情况的所有索引。

$needle = 'sun';

foreach($arr as $entryKey => &$entry) {
    foreach($entry['children'] as $childKey => &$child) {
        foreach($child['painting'] as $paintingKey => $painting) {
            if (strpos($painting, $needle) === false) {
                unset($child['painting'][$paintingKey]);
            }
        }

        if (empty($child['painting'])) {
            unset($entry['children'][$childKey]);
        }
    }

    if (empty($entry['children'])) {
        unset($arr[$entryKey]);
    }
}
unset($entry, $child); // Take no risks with references

在PHP中的多维数组中搜索过滤器

1 个答案: