PHP 輸出數組全部索引值一樣的值

PHP 輸出數組所有索引值一樣的值
，我想輸出所有鍵為uses-permission android:name後的值，應該怎麼做？uses-permission android:name條數不固定的。
------解決方案--------------------
x.xml

$xmlfile = 'x.xml';
$data = simpleXML_load_file($xmlfile);

$key = 'uses-permission';
$arr = array();
foreach($data->$key as $uses_permission){
    $c = (string)$uses_permission->attributes('android', true);
    array_push($arr, $c);
}

print_r($arr);
?>

輸出：
Array
(
[0] => android.permission.ACCESS_COARSE_LOCATION
[1] => android.permission.ACCESS_FINE_LOCATION
[2] => android.permission.ACCESS_WIFI_STATE
[3] => android.permission.ACCESS_NETWORK_STATE
[4] => android.permission.CHANGE_WIFI_STATE
[5] => android.permission.INTERNET
)

