在PHP中设置多维数组对象中的键和值

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

// 设置第一层键为'key3'，值为一个空数组
$multiArray['key3'] = array();

// 设置第二层键为'subkey5'，值为'value5'
$multiArray['key3']['subkey5'] = 'value5';

// 更新第一层键为'key1'的值
$multiArray['key1'] = array(
    'subkey1' => 'new value1',
    'subkey2' => 'new value2'
);

// 更新第二层键为'subkey3'的值
$multiArray['key2']['subkey3'] = 'new value3';

// 获取第一层键为'key1'的值
$value1 = $multiArray['key1'];

// 获取第二层键为'subkey4'的值
$value4 = $multiArray['key2']['subkey4'];