计数重复值在多维数组在PHP

Question

下面是我的数组的一个示例。我试图计数每次user_id是在数组中。我试图计数每次user_id是在数组中。

Array
(
[0] => Array
    (
        [user_id] => 57002892
        [page_id] => 109446562415595
    )
[1] => Array
    (
        [user_id] => 515576073
        [page_id] => 109446562415595
    )
[2] => Array
    (
        [user_id] => 560299932
        [page_id] => 109446562415595
    )
[3] => Array
    (
        [user_id] => 607960053
        [page_id] => 109446562415595
    )
[4] => Array
    (
        [user_id] => 607960053
        [page_id] => 109446562415595
    )
)

，这应该输出以下内容:

Array
(
[0] => Array
    (
        [user_id] => 57002892
        [count] => 1
    )
[1] => Array
    (
        [user_id] => 515576073
        [count] => 1
    )
[2] => Array
    (
        [user_id] => 560299932
        [count] => 1
    )
[3] => Array
    (
        [user_id] => 607960053
        [count] => 2
    )
)

这是可能的吗?

Answer 1

让您的示例输入为下面代码中的$input_array:

$user_id_hash = array();
foreach( $input_array as $occur )
{
    if( !array_key_exists( $occur['user_id'], $user_id_hash ) )
    {
        $user_id_hash[$occur['user_id']] = 0;
    }
    $user_id_hash[$occur['user_id']]++;
}
$user_id_arr = array();
foreach( $user_id_hash as $user_id => $count )
{
    $user_id_arr[] = array( 'user_id' => $user_id, 'count' => $count );
}

如果您对关联数组满意，则可以删除第二个循环。