如何使用PHP将数组的第一个键与数组的其余键分开？

$array = ['key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3'];

$firstKey = array_shift(array_keys($array));
$restKeys = array_keys($array);

echo "第一个键：" . $firstKey . "\n";
echo "其余键：" . implode(", ", $restKeys) . "\n";

$array = ['key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3'];

$firstKey = null;
$restKeys = [];

foreach ($array as $key => $value) {
    if ($firstKey === null) {
        $firstKey = $key;
    } else {
        $restKeys[] = $key;
    }
}

echo "第一个键：" . $firstKey . "\n";
echo "其余键：" . implode(", ", $restKeys) . "\n";