blocks|key|208200|text|要轻松获取使用的特征，可以调用class_uses()|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|208201|$usedTraits+=+class_uses(MyClass);
//+or
$usedTraits+=+class_uses($myObject);|code-block|syntax|javascript|208202|一般建议|208203|在检查可用的功能时，我通常建议使用interfaces。要向界面添加默认功能，您可以使用traits。这样，您还可以从类型提示中受益。|style|CODE|208204|通过实现接口来强制具有功能的对象，然后使用特征来实现该接口的默认代码。|208205|class+MyClass+
++++implements+SomeInterface+
{
++++use+SomeTrait;
}|208206|然后你可以通过以下方式检查界面：|208207|$myObject+=+new+MyClass();
if+($myObject+instanceof+SomeInterface)+{
++++//...
}|208208|并且仍然使用类型提示；|208209|function+someFunction(+SomeInterface+$object+)
{+
++++//...
}|208210|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/class_uses^0|F|C|0|0|0|0|H|A|18|6|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|D|3|E|5|F|7|1C|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1D|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1E|8|@$A|1F|B|1G|M|N]|$A|1H|B|1I|M|N]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1J|8|@]|9|@]|C|$]]|$1|Q|3|R|5|F|7|1K|8|@]|9|@]|C|$G|H]]|$1|S|3|T|5|6|7|1L|8|@]|9|@]|C|$]]|$1|U|3|V|5|F|7|1M|8|@]|9|@]|C|$G|H]]|$1|W|3|X|5|6|7|1N|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|F|7|1O|8|@]|9|@]|C|$G|H]]|$1|10|3|-4|5|6|7|1P|8|@]|9|@]|C|$]]]|11|$12|$5|13|14|15|C|$16|17]]]]

To easily get the used traits you can call <a href="http://php.net/class_uses">class_uses()</a>

<pre><code>$usedTraits = class_uses(MyClass);
// or
$usedTraits = class_uses($myObject);
</code></pre>

<h1>General recommendations</h1>

When checking for available functionality, I would generally recommend to use <code>interfaces</code>. To add default functionality to an interface you would use <code>traits</code>. This way you can also benefit from type hinting.

Force an object having functionality by implementing an interface and then use a trait to implement default code for that interface.

<pre><code>class MyClass 
 implements SomeInterface 
{
 use SomeTrait;
}
</code></pre>

Then you can check the interface by;

<pre><code>$myObject = new MyClass();
if ($myObject instanceof SomeInterface) {
 //...
}
</code></pre>

And still use type hinting;

<pre><code>function someFunction( SomeInterface $object )
{ 
 //...
}
</code></pre>

blocks|key|426302|text|您可以使用ReflectionClass自己编写它|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|426303|$rc+=+new+ReflectionClass('myClass');
$count+=+count($rc->getTraits());|code-block|syntax|javascript|426304|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/class.reflectionclass.php^0|5|F|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can write it yourself, by using the <a href="http://php.net/manual/en/class.reflectionclass.php" rel="noreferrer">ReflectionClass</a>

<pre><code>$rc = new ReflectionClass('myClass');
$count = count($rc-&gt;getTraits());
</code></pre>

blocks|key|426451|text|就我的2美分=)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426452|in_array(+"CLASS_NAME",+class_uses($model)+)+|code-block|syntax|javascript|426453|或使用PHP+>+5.6|426454|in_array(+CLASS_NAME::class,+class_uses($model)+)|426455|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Just my 2 cents =)

<pre><code>in_array( "CLASS_NAME", class_uses($model) ) 
</code></pre>

Or with PHP > 5.6

<pre><code>in_array( CLASS_NAME::class, class_uses($model) )
</code></pre>

blocks|key|208260|text|class-uses(<class>)将获得<class>的直接特征，但它不会通过父类或特征的特征等方式获得所有遗传特征。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|208261|如果你需要获取一个类的所有继承特征，我建议你阅读官方文档中的评论：|208262|http://php.net/manual/en/function.class-uses.php|208263|entityMap|0|LINK|mutability|MUTABLE|url^0|0|J|M|7|0|0|0|1C|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|J|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|I]]]]

<code>class-uses(&lt;class&gt;)</code> will get the immediate traits of <code>&lt;class&gt;</code> however it won't get all inherited traits by way of parent classes or traits of traits etc...

If you need to get absolutely all inherited traits on a class I would recommend reading the comments in the official docs here:

<a href="http://php.net/manual/en/function.class-uses.php" rel="nofollow">http://php.net/manual/en/function.class-uses.php</a>

blocks|key|208312|text|如果你想从子类中获取特征，class_uses和ReflectionClass->getTraits将不起作用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|208313|举例说明。|208314|trait+A+{}

class+Mother+{
++++use+A;
}

class+Child+extends+Mother+{}

var_dump(class_uses('Child'));++//+empty+array
var_dump(class_uses('Mother'));+//+has+A|code-block|syntax|javascript|208315|我有这个问题，所以我写了一些简单的代码来从类中获取所有的特征。|208316|function+all_class_uses($model)
{
++++$class+=+new+ReflectionClass($model);
++++$traits+=+$class->getTraits();
++++while($parent+=+$class->getParentClass())+{
++++++++$traits+%2B=+$class->getTraits();
++++++++$class+=+$parent;
++++}
++++return+array_combine(array_keys($traits),+array_keys($traits));
}|208317|entityMap^0|D|A|O|Q|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

<code>class_uses</code> and <code>ReflectionClass-&gt;getTraits</code> will not work if you want to get traits from child class. 

Example. 


<pre class="lang-php prettyprint-override"><code>trait A {}

class Mother {
 use A;
}

class Child extends Mother {}

var_dump(class_uses('Child')); // empty array
var_dump(class_uses('Mother')); // has A
</code></pre>

I have this problem so I write simple code for get all traits from classes.

<pre class="lang-php prettyprint-override"><code>function all_class_uses($model)
{
 $class = new ReflectionClass($model);
 $traits = $class-&gt;getTraits();
 while($parent = $class-&gt;getParentClass()) {
 $traits += $class-&gt;getTraits();
 $class = $parent;
 }
 return array_combine(array_keys($traits), array_keys($traits));
}
</code></pre>

blocks|key|426398|text|我希望这将是有用的(感谢莫里斯的接口使用)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426399|++++interface+IHaveHasTrait
++++{
++++++++public+function+has_trait($name);
++++};

++++trait+THaveHasTrait
++++{
++++++++public+function+has_trait($name)
++++++++{
++++++++++++$classes+=+class_parents(+$this+);
++++++++++++$classes[]+=+get_class(+$this+);
++++++++++++foreach(+$classes+as+$class+)+{
++++++++++++++++foreach(+class_uses(+$class+)+as+$t+)+{
++++++++++++++++++++if(+$t+===+$name+)+{
++++++++++++++++++++++++return+true;
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++++++return+false;
++++++++}
++++};

++++trait+TLinkedListItem
++++{
++++++++use+THaveHasTrait;
++++++++public+$next;
++++++++public+$prev;
++++};

++++class+A+implements+IHaveHasTrait
++++{
++++++++use+TLinkedListItem;
++++++++public+$text;

++++++++public+function+__construct(+$_text+)
++++++++{
++++++++++++$this->text+=+$_text;
++++++++}
++++};

++++class+B+extends+A{};

++++class+C+extends+B{};

++++class+LinkedList
++++{
++++++++public+function+insertItem(+&$item,+$position=0,+$relative=false+)
++++++++{
++++++++++++if(+is_a(+$item,+'IHaveHasTrait'+)+)+{
++++++++++++++++echo+$item->has_trait(+'TLinkedListItem'+)+?+'has'+:+'not';
++++++++++++}
++++++++}
++++};

++++$a+=+new+C('a');
++++$l+=+new+LinkedList;
++++$l->insertItem($a);
++++?>|code-block|syntax|javascript|426400|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I wish that will be useful (thanks to Maurice for interface usage):
 

<pre><code> interface IHaveHasTrait
 {
 public function has_trait($name);
 };

 trait THaveHasTrait
 {
 public function has_trait($name)
 {
 $classes = class_parents( $this );
 $classes[] = get_class( $this );
 foreach( $classes as $class ) {
 foreach( class_uses( $class ) as $t ) {
 if( $t === $name ) {
 return true;
 }
 }
 }
 return false;
 }
 };

 trait TLinkedListItem
 {
 use THaveHasTrait;
 public $next;
 public $prev;
 };

 class A implements IHaveHasTrait
 {
 use TLinkedListItem;
 public $text;

 public function __construct( $_text )
 {
 $this-&gt;text = $_text;
 }
 };

 class B extends A{};

 class C extends B{};

 class LinkedList
 {
 public function insertItem( &amp;$item, $position=0, $relative=false )
 {
 if( is_a( $item, 'IHaveHasTrait' ) ) {
 echo $item-&gt;has_trait( 'TLinkedListItem' ) ? 'has' : 'not';
 }
 }
 };

 $a = new C('a');
 $l = new LinkedList;
 $l-&gt;insertItem($a);
 ?&gt;
</code></pre>

blocks|key|426335|text|简而言之:你不应该这么做。特征几乎就是复制和粘贴代码。你不需要知道使用了哪些特征，只需要知道这些特征产生了什么。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|426336|我不想给出的答案是:使用ReflectionClass::getTraits。我不打算详细说明这一点。|offset|length|426337|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/reflectionclass.gettraits.php^0|0|C|Q|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Short answer: you shouldn't. Traits are almost exactly copy and paste code. You don't NEED to know which traits are used, only on what the traits generate. 

Answer I don't want to give: use <a href="http://www.php.net/manual/en/reflectionclass.gettraits.php" rel="nofollow">ReflectionClass::getTraits</a>. I'm not going to elaborate on this one.

Is there any function in PHP (5.4) to get used traits as array or similar:

<pre><code>class myClass extends movingThings {
 use bikes, tanks;

 __construct() {
 echo 'I\'m using the two traits:' . ????; // bikes, tanks
 }
}
</code></pre>

how to get used traits in php-class?

PHP (5.4)中有没有什么函数可以将特征用作数组或类似的函数：class myClass extends movingThings {  use bikes, tanks;  __construct() {    echo 'I\'m using the two traits:' . ????; // bikes, tanks  }}

问如何在php-class中获取使用的特征？
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问如何在php-class中获取使用的特征？
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