如何在满足Php条件的情况下通过键从多维数组中移除数组

<?php
$array = array(
    'key1' => array(
        'subkey1' => 'value1',
        'subkey2' => 'value2'
    ),
    'key2' => array(
        'subkey3' => 'value3',
        'subkey4' => 'value4'
    )
);

$keyToRemove = 'key1';
if (isset($array[$keyToRemove])) {
    unset($array[$keyToRemove]);
}

print_r($array);
?>

<?php
$array = array(
    'key1' => array(
        'subkey1' => 'value1',
        'subkey2' => 'value2'
    ),
    'key2' => array(
        'subkey3' => 'value3',
        'subkey4' => 'value4'
    )
);

$keyToRemove = 'key1';
$array = array_filter($array, function($key) use ($keyToRemove) {
    return $key !== $keyToRemove;
});

print_r($array);
?>