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<div id="language.attributes.syntax" class="sect1">
   <h2 class="title">Attribute syntax</h2>

   <p class="para">
    Attribute syntax consists of several key components. An attribute
    declaration starts with <code class="literal">#[</code> and ends with
    <code class="literal">]</code>. Inside, one or more attributes can be listed,
    separated by commas. The attribute name can be unqualified, qualified,
    or fully-qualified, as described in <a href="language.namespaces.basics.php" class="link">Using Namespaces Basics</a>.
    Arguments to the attribute are optional and enclosed in parentheses
    <code class="literal">()</code>. Arguments can only be literal values or constant
    expressions. Both positional and named argument syntax are supported.
   </p>

   <p class="para">
    Attribute names and their arguments are resolved to a class, and the arguments
    are passed to its constructor when an instance of the attribute is requested
    through the Reflection API. Therefore, it is recommended to introduce a class
    for each attribute.
   </p>

   <div class="example" id="example-396">
    <p><strong>Example #1 Attribute Syntax</strong></p>

    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">// a.php<br /></span><span style="color: #007700">namespace </span><span style="color: #0000BB">MyExample</span><span style="color: #007700">;<br /><br />use </span><span style="color: #0000BB">Attribute</span><span style="color: #007700">;<br /><br />#[</span><span style="color: #0000BB">Attribute</span><span style="color: #007700">]<br />class </span><span style="color: #0000BB">MyAttribute<br /></span><span style="color: #007700">{<br />    const </span><span style="color: #0000BB">VALUE </span><span style="color: #007700">= </span><span style="color: #DD0000">'value'</span><span style="color: #007700">;<br /><br />    private </span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br /><br />    public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">(</span><span style="color: #0000BB">$value </span><span style="color: #007700">= </span><span style="color: #0000BB">null</span><span style="color: #007700">)<br />    {<br />        </span><span style="color: #0000BB">$this</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">value </span><span style="color: #007700">= </span><span style="color: #0000BB">$value</span><span style="color: #007700">;<br />    }<br />}<br /><br /></span><span style="color: #FF8000">// b.php<br /><br /></span><span style="color: #007700">namespace </span><span style="color: #0000BB">Another</span><span style="color: #007700">;<br /><br />use </span><span style="color: #0000BB">MyExample\MyAttribute</span><span style="color: #007700">;<br /><br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">]<br />#[</span><span style="color: #0000BB">\MyExample\MyAttribute</span><span style="color: #007700">]<br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">1234</span><span style="color: #007700">)]<br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">value</span><span style="color: #007700">: </span><span style="color: #0000BB">1234</span><span style="color: #007700">)]<br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">::</span><span style="color: #0000BB">VALUE</span><span style="color: #007700">)]<br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"key" </span><span style="color: #007700">=&gt; </span><span style="color: #DD0000">"value"</span><span style="color: #007700">))]<br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">100 </span><span style="color: #007700">+ </span><span style="color: #0000BB">200</span><span style="color: #007700">)]<br />class </span><span style="color: #0000BB">Thing<br /></span><span style="color: #007700">{<br />}<br /><br />#[</span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">1234</span><span style="color: #007700">), </span><span style="color: #0000BB">MyAttribute</span><span style="color: #007700">(</span><span style="color: #0000BB">5678</span><span style="color: #007700">)]<br />class </span><span style="color: #0000BB">AnotherThing<br /></span><span style="color: #007700">{<br />}</span></span></code></div>
    </div>

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