PhP将日期范围数组作为键-获得意外输出

$dateRange = array(
    array('start' => '2022-01-01', 'end' => '2022-01-05'),
    array('start' => '2022-01-06', 'end' => '2022-01-10'),
    array('start' => '2022-01-11', 'end' => '2022-01-15')
);

$result = array();

foreach ($dateRange as $range) {
    $result[$range] = 'Some value';
}

print_r($result);

Array
(
    [Array] => Some value
)

$dateRange = array(
    array('start' => '2022-01-01', 'end' => '2022-01-05'),
    array('start' => '2022-01-06', 'end' => '2022-01-10'),
    array('start' => '2022-01-11', 'end' => '2022-01-15')
);

$result = array();

foreach ($dateRange as $range) {
    $key = $range['start'] . '-' . $range['end'];
    $result[$key] = 'Some value';
}

print_r($result);

Array
(
    [2022-01-01-2022-01-05] => Some value
    [2022-01-06-2022-01-10] => Some value
    [2022-01-11-2022-01-15] => Some value
)