array_column_recursive

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思考并回答以下问题：

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function array_column_recursive(array $haystack, $needle) {
    $found = [];
    array_walk_recursive($haystack, function($value, $key) use (&$found, $needle) {
        if ($key == $needle)
            $found[] = $value;
    });
    return $found;
}

$records = [
    [
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe',
        'meta' => [
            'registered_on' => '1/1/2019',
            'more_meta' => [
                'registered_on' => 'i am 3 levels deep',
            ]
        ]
    ],
    [
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith',
        'meta' => [
            'registered_on' => '6/1/2019'
        ]
    ],
    [
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones',
        'meta' => [
            'registered_on' => '12/1/2019'
        ]
    ],
    [
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe',
        'meta' => [
            'registered_on' => '1/1/2020'
        ]
    ]
];

$registeredOnArray = array_column_recursive($records, 'registered_on');
var_export($registeredOnArray);

结果：

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/*
array (
  0 => '1/1/2019',
  1 => 'i am 3 levels deep',
  2 => '6/1/2019',
  3 => '12/1/2019',
  4 => '1/1/2020',
)
 */
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