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php - 计算嵌套数组元键的值

问题描述

我想计算元值在某个页面（id）内的次数。我已经得到了这样的元值：

function aantal_reviews_ophalen() {
$get_page_ID = get_queried_object_id();

$get_review_count = get_post_meta( $get_page_ID, $key = 'rwp_rating_0' , $single = false);  

return array_count_values($get_review_count)['343'];
}

在这种情况下， 343是字段 rating_post_id 的值，但不起作用。

我尝试了很多东西，但似乎没有任何效果。

我也用这个例子试过：

$array = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");
$counts = array_count_values($array);
return $counts['Ben'];

像魅力一样工作，但这是因为这个数组与我从 $get_review_count 获得的数组不同。

当我print_r($get_review_count);得到这个结果时：

Array ( [0] => Array ( [rating_id] => rwp_rating_5b4da83f6b281 [rating_post_id] => 343 [rating_review_id] => 0 [rating_score] => Array ( [0] => 2 [1] => 2 [2] => 3.5 ) [rating_user_id] => 0 [rating_user_name] => Joep van Dongen [rating_user_email] => testmail@gmail.com [rating_title] => Dit is een test beoordeling [rating_comment] => Dit is een test beoordeling [rating_images] => Array ( ) [rating_date] => 1531815999 [rating_status] => published [rating_verified] => [rating_template] => rwp_template_5b16a33aa16b7 [rating_privacy] => Array ( ) ) [1] => Array ( [rating_id] => rwp_rating_5bd0271605392 [rating_post_id] => 343 [rating_review_id] => 0 [rating_score] => Array ( [0] => 5 [1] => 5 [2] => 5 ) [rating_user_id] => 4 [rating_user_name] => [rating_user_email] => [rating_title] => Harry de Vries [rating_comment] => Dit is een testreview om te kijken of et werkrty [rating_images] => Array ( ) [rating_date] => 1540368150 [rating_status] => published [rating_verified] => [rating_template] => rwp_template_5b16a33aa16b7 [rating_privacy] => Array ( [t5bab7c0abed1f] => true ) ) )

这看起来像一个嵌套数组，但老实说，我不知道如何检索我想要的数据。

如何计算值 343 的 [rating_post_id] 在此数组中出现多少次并返回该值？

编辑 好的，我现在用这个：

echo var_export($get_review_count, true);

这就是我得到的：

array ( 0 => array ( 'rating_id' => 'rwp_rating_5b4da83f6b281', 'rating_post_id' => 343, 'rating_review_id' => '0', 'rating_score' => array ( 0 => 2.0, 1 => 2.0, 2 => 3.5, ), 'rating_user_id' => 0, 'rating_user_name' => 'Joep van Dongen', 'rating_user_email' => 'dongen.van.joep@gmail.com', 'rating_title' => 'Dit is een test beoordeling', 'rating_comment' => 'Dit is een test beoordeling', 'rating_images' => array ( ), 'rating_date' => 1531815999, 'rating_status' => 'published', 'rating_verified' => false, 'rating_template' => 'rwp_template_5b16a33aa16b7', 'rating_privacy' => array ( ), ), 1 => array ( 'rating_id' => 'rwp_rating_5bd0271605392', 'rating_post_id' => 343, 'rating_review_id' => '0', 'rating_score' => array ( 0 => 5.0, 1 => 5.0, 2 => 5.0, ), 'rating_user_id' => 4, 'rating_user_name' => '', 'rating_user_email' => '', 'rating_title' => 'Harry de Vries', 'rating_comment' => 'Dit is een testreview om te kijken of et werkrty', 'rating_images' => array ( ), 'rating_date' => 1540368150, 'rating_status' => 'published', 'rating_verified' => false, 'rating_template' => 'rwp_template_5b16a33aa16b7', 'rating_privacy' => array ( 't5bab7c0abed1f' => 'true', ), ), )

标签： phparraysmultidimensional-arraycountmetadata

解决方案

考虑你有这样的$get_review_count数组： 

$get_review_count = [
    [
        'rating_id' => 'rwp_rating_5b4da83f6b281',
        'rating_post_id' => 343 ,
        'rating_review_id' => 0 ,
        'rating_score' => [
            '0' => 2 ,
            '1' => 2 ,
            '2' => 3.5 ],
        'rating_user_id' => 0 ,
        'rating_user_name' => 'Joep van Dongen ',
        'rating_user_email' => 'testmail@gmail.com ',
        'rating_title' => 'Dit is een test beoordeling ',
        'rating_comment' => 'Dit is een test beoordeling ',
        'rating_images' => [],
        'rating_date' => 1531815999 ,
        'rating_status' => 'published ',
        'rating_verified' => '',
        'rating_template' => 'rwp_template_5b16a33aa16b7 ',
        'rating_privacy' => []
    ],
    [
        'rating_id' => 'rwp_rating_5b4da83f6b281',
        'rating_post_id' => 343 ,
        'rating_review_id' => 0 ,
        'rating_score' => [
            '0' => 2 ,
            '1' => 2 ,
            '2' => 3.5 ],
        'rating_user_id' => 0 ,
        'rating_user_name' => 'Joep van Dongen ',
        'rating_user_email' => 'testmail@gmail.com ',
        'rating_title' => 'Dit is een test beoordeling ',
        'rating_comment' => 'Dit is een test beoordeling ',
        'rating_images' => [],
        'rating_date' => 1531815999 ,
        'rating_status' => 'published ',
        'rating_verified' => '',
        'rating_template' => 'rwp_template_5b16a33aa16b7 ',
        'rating_privacy' => []
    ],
];

由于它是多维数组，您可以使用仅array_column限制'rating_post_id'列，然后执行以下操作array_count_values： 

echo array_count_values(array_column($get_review_count, 'rating_post_id'))['343'];

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