如果值存在于所有数组中，如何在PHP中从多维数组返回重复值。

几天来，我一直在努力解决这个问题，但没有取得好的结果。我在PHP中有一个多维对象数组（print\r）：

我想获取所有数组中存在的重复值，例如：

stdClass Object
        (
            [productoId] => 16
        )

但不是：

stdClass Object
        (
            [productoId] => 21
        )

你知道我怎样才能做到这一点吗？

像这样：

$array = array(
            3 => array((object) array('productoId' => '16'), (object) array('productoId' => '21'), (object) array('productoId' => '22')),
            7 => array((object) array('productoId' => '16'), (object) array('productoId' => '21'), (object) array('productoId' => '22')),
            6 => array((object) array('productoId' => '16'), (object) array('productoId' => '17'))
        );

$arrays = count($array);
$match = array();
$duplicates = array();
foreach($array as $one){
    foreach($one as $single){
        $var = (array)$single;
        if(!isset($match[$var['productoId']])) { $match[$var['productoId']] = 0; }
        $match[$var['productoId']]++;
        if($match[$var['productoId']] == $arrays){
            $duplicates[] = (int)$var['productoId'];
        }
    }
}
print_r($duplicates);

$array = array(
            3 => array((object) array('productoId' => '16'), (object) array('productoId' => '21'), (object) array('productoId' => '22')),
            7 => array((object) array('productoId' => '16'), (object) array('productoId' => '21'), (object) array('productoId' => '22')),
            6 => array((object) array('productoId' => '16'), (object) array('productoId' => '17'))
        );

$arrays = count($array);
$match = array();
$duplicates = array();
foreach($array as $one){
    foreach($one as $single){
        $var = (array)$single;
        if(!isset($match[$var['productoId']])) { $match[$var['productoId']] = 0; }
        $match[$var['productoId']]++;
        if($match[$var['productoId']] == $arrays){
            $duplicates[] = (int)$var['productoId'];
        }
    }
}
print_r($duplicates);