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Accepted
Владимир
Asked:2020-09-18 23:00:30 +0000 UTC2020-09-18 23:00:30 +0000 UTC

计算PHP数组中的相等值

  • 772

有数组：

$data = [
    array(
        [0] => "Автобусные",
        [1] => "Пешеходные"
    ),
    array(
        [0] => "Исторические",
        [1] => "Пешеходные",
        [2] => "Водные"
    ),
    array(
        [0] => "Пешеходные",
        [1] => "Тематические",
        [2] => "Исторические"
    )
];

很长的路要走：

$result = [];
foreach ($data as $row) {
    foreach ($row as $val) {
        if(!empty($val)) array_push($result, $val);
    }
}
$result = array_count_values($result);

结果：

Array(
    [Автобусные] => 1
    [Пешеходные] => 3
    [Исторические] => 2
    [Водные] => 1
    [Тематические] => 1
)

有没有办法更快地重新计算数组中的值？

php

1 个回答

  1. Best Answer

    最初我们有以下数组：

    $data = [
    ['Автобусные', 'Пешеходные' ],
    ['Исторические', 'Пешеходные', 'Водные'],
    ['Пешеходные', 'Тематические', 'Исторические']
];

    方法RecursiveIteratorIterator：

    foreach (new RecursiveIteratorIterator(new RecursiveArrayIterator($data)) as $v)
    $result[] = $v;

print_r(array_count_values($result));

    或使用的变体call_user_func_array：

    print_r(array_count_values(call_user_func_array('array_merge', $data)));

    或使用的变体array_reduce：

    print_r(array_count_values(array_reduce($data, 'array_merge', [])));
    • 1

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