blocks|key|4623600|text|您可以使用HYDRATE_ARRAY告诉Doctrine返回一个数组，而不是映射的对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4623601|这样，就可以直接调用isset()。|4623602|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can tell Doctrine to return an array, instead of mapped objects, by using HYDRATE_ARRAY.

That way, isset() can be called directly.

blocks|key|4623635|text|你可以用@作为链的前缀，这会抑制错误输出--这样你就不需要检查它了。如果它不存在，它将不会输出任何内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4623636|<?php+echo+@$this->personData->getPersonAdress()->getPersonStreet();+?>|code-block|syntax|javascript|4623637|通常不推荐使用@运算符，但在这种情况下，它似乎是一个合适的解决方案。(缺点是您可能会遗漏可能来自此行的其他错误)|4623638|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You could prefix the chain with @, which suppresses error output - then you wouldn't need to check it at all. If it doesn't exist, it will simply not output anything.

<pre><code>&lt;?php echo @$this-&gt;personData-&gt;getPersonAdress()-&gt;getPersonStreet(); ?&gt;
</code></pre>

It isn't usually recommended to use the @ operator, but in this case it seems like an appropriate solution. (The disadvantage is that you would miss other errors that may come from this line)

blocks|key|2549870|text|我自己解决了这个问题，实现了一个Zend+View+Helper，它打印出每个值，忽略非对象属性或NULL关联可能发生的错误。这对使用Zend+Framework+%2B+Doctrine+2的每个人都很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2549871|用法|2549872|而不是|2549873|2549874|+$this->address->getAddress()->getCountry()->getCountryId()|blockquote|2549875|2549876|2549877|Use+(如果未设置，则提供值或默认值(0，第三个参数))|2549878|2549879|+$this->Printsafe($this->address，"getAddress/getCountry/getCountryId"，0)|2549880|2549881|2549882|代码跟随|2549883|class+Printsafe+extends+Zend_View_Helper_Abstract+{

++++public+function+isObjectOrSet($data,+$properties)
++++{
++++++++if+($data+!=+null)
++++++++{
++++++++++++if(is_object($data))
++++++++++++{
++++++++++++++++if+(isset($properties[0]))
++++++++++++++++{
++++++++++++++++++++$actual_property+=+array_shift($properties);
++++++++++++++++++++return+$this->isObjectOrSet($data->{$actual_property}(),+$properties);
++++++++++++++++}
++++++++++++}
++++++++++++elseif(isset($data))
++++++++++++{
++++++++++++++++return+$data;
++++++++++++}
++++++++++++else
++++++++++++++++return+null;
++++++++}
++++++++else
++++++++++++return+null;
++++}

++++/**
++++*+Wants+data+and+getters+%2B+properties
++++*+Tests+if+they+are+set+and+returns+requested+value
++++*+Returns+empty+value+(instead+of+NULL)+if+any+error+occurs
++++*+
++++*+@param++mixed+$data+-+Example+$this->personData
++++*+@param++string+$properties+-+Example+"getPersontype/getNotation"
++++*+@param++mixed+$default+-+return+value+if+not+set.+Default+is+empty+string.+
++++*+
++++*+@return+mixed+$value
++++*/
++++public+function+printsafe($data+=+null,+$properties='',+$default+=+'')+{

++++++++$return+=+null;

++++++++if+($data+!=+null)
++++++++{
++++++++++++if+($properties+!=+'')
++++++++++++{
++++++++++++++++$prop_array+=+explode("/",+$properties);
++++++++++++++++$return+=+$this->isObjectOrSet($data,+$prop_array);
++++++++++++}
++++++++}

++++++++if+($return+==+null)
++++++++++++$return+=+$default;

++++++++return+$return;
++++}
}|code-block|syntax|javascript|2549884|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|15|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|I|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1D|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1E|8|@]|9|@]|A|$X|Y]]|$1|Z|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|10|$]]

I solved the issue myself by implementing a Zend View Helper that prints out every value ignoring errors that could occur by non-object properties or NULL associations.
This should be useful to everyone working with Zend Framework + Doctrine 2.

<h2>Usage</h2>

Instead of

<blockquote>
 $this->address[0]->getAddress()->getCountry()->getCountryId()
</blockquote>

Use (it delivers the value or default (0, third parameter) if not set)

<blockquote>
 $this->Printsafe($this->address[0], "getAddress/getCountry/getCountryId", 0)
</blockquote>

<h2>Code following</h2>

<pre><code>class Printsafe extends Zend_View_Helper_Abstract {

 public function isObjectOrSet($data, $properties)
 {
 if ($data != null)
 {
 if(is_object($data))
 {
 if (isset($properties[0]))
 {
 $actual_property = array_shift($properties);
 return $this-&gt;isObjectOrSet($data-&gt;{$actual_property}(), $properties);
 }
 }
 elseif(isset($data))
 {
 return $data;
 }
 else
 return null;
 }
 else
 return null;
 }

 /**
 * Wants data and getters + properties
 * Tests if they are set and returns requested value
 * Returns empty value (instead of NULL) if any error occurs
 * 
 * @param mixed $data - Example $this-&gt;personData
 * @param string $properties - Example "getPersontype/getNotation"
 * @param mixed $default - return value if not set. Default is empty string. 
 * 
 * @return mixed $value
 */
 public function printsafe($data = null, $properties='', $default = '') {

 $return = null;

 if ($data != null)
 {
 if ($properties != '')
 {
 $prop_array = explode("/", $properties);
 $return = $this-&gt;isObjectOrSet($data, $prop_array);
 }
 }

 if ($return == null)
 $return = $default;

 return $return;
 }
}
</code></pre>

A Zend-Framework project that uses Doctrine.
Data comes in form of objects. In my Zend View i access it like

<pre><code>$this-&gt;personData-&gt;getPersonAdress()-&gt;getPersonStreet();
</code></pre>

Since its possible that a Person doesnt have an associated adress, we have to check if the personadress exists and if the personStreet is filled before echoing because otherwise an echoing NULL error may occur.

So we use some IFs with isset:

<pre><code>&lt;? if($this-&gt;personData-&gt;getPersonaddress()) echo $this-&gt;personData-&gt;getPersonaddress()-&gt;getPersonstreet(); else echo "''"?&gt;
</code></pre>

Example (worst case):

<pre><code>&lt;?
 if(isset($this-&gt;address[0]) &amp;&amp; is_object($this-&gt;address[0]))
 {
 $help2=$this-&gt;address[0]-&gt;getAddress();
 if (isset($help2) &amp;&amp; is_object($help2))
 {
 $help=$this-&gt;address[0]-&gt;getAddress()-&gt;getCountry();
 if (isset($help) &amp;&amp; is_object($help) &amp;&amp; $help-&gt;getCountryId())
 {
 echo $this-&gt;address[0]-&gt;getAddress()-&gt;getCountry()-&gt;getCountryId();
 }
 }
 }
?&gt;
</code></pre>

We need a solution or eventualla a Zend_view helper to simplify the procedure of echoing these values.

Any ideas would be highly appreciated..

Isset with (n-depth) object getters

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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使用Doctrine的Zend-Framework项目。数据以对象的形式出现。在我的Zend视图中，我访问它的方式如下$this->personData->getPersonAdress()->getPersonStreet();由于Person可能没有关联的地址，因此在回显之前，我们必须检查personadress是...

问带有(n深度)对象getter的Isset
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