YALINQO:查询深度数组

Question

Array
(
[0] => Array
    (
        [EndpointArn] => arn:aws:sns
        [Attributes] => Array
            (
                [Enabled] => true
                [Token] => APA91
                [CustomUserData] => Alcatel
            )

    )

[1] => Array
    (
        [EndpointArn] => arn:aws:sns:ap
        [Attributes] => Array
            (
                [Enabled] => true
                [Token] => APA91bGC
                [CustomUserData] => Oppo
            )

    )

)

我从源头得到这个数组。我对yalinqo很陌生，所以在尝试和错误之后，我碰巧用以下代码打印了CustomUserData：

$result= from($Model2['Endpoints'][0]['Attributes'])->select(function($np) { return $np; });

print $result->toArrayDeep()['CustomUserData']; 

现在我想要基于我选择的EndpointArn打印CustomUserData，但是我的代码不工作。

这是代码：

print 
from($Model2['Endpoints'])
->select(function($np){ return $np['EndpointArn']; })
->where(function($np){return $np['Attributes']['CustomUserData'] == 'Oppo';})
->toArrayDeep()
;

错误消息：

Warning: Illegal string offset 'Attributes' in /home/u
Warning: Illegal string offset 'CustomUserData' in /home/u  
Warning: Illegal string offset 'Attributes' in /home/u    
Warning: Illegal string offset 'CustomUserData' in /home/u

此代码：

print 
from($Model2['Endpoints'])
->select(function($np){ return $np['EndpointArn']; })
->where(function($np){return $np['Attributes']['CustomUserData'] == 'Oppo';})
;

错误消息：

Catchable fatal error: Object of class YaLinqo\Enumerable could not be converted to string in

有人能遮住这里的光线吗？

谢谢。

Answer 1

在尝试和错误之后，下面是答案：

print 
from($Model2['Endpoints'])
->where(function($np){return $np['Attributes']['CustomUserData'] == 'Oppo';})
->select(function($np){ return $np['EndpointArn']; })
->toString()
;

结果

arn:aws:sns:ap