<documentation title="Class Declaration">
<standard>
<![CDATA[
Each class must be in a file by itself and must be under a namespace (a top-level vendor name).
]]>
</standard>
<code_comparison>
<code title="Valid: One class in a file.">
<![CDATA[
<?php
namespace Foo;
<em>class Bar</em> {
}
]]>
</code>
<code title="Invalid: Multiple classes in a single file.">
<![CDATA[
<?php
namespace Foo;
<em>class Bar</em> {
}
<em>class Baz</em> {
}
]]>
</code>
</code_comparison>
<code_comparison>
<code title="Valid: A vendor-level namespace is used.">
<![CDATA[
<?php
<em>namespace Foo;</em>
class Bar {
}
]]>
</code>
<code title="Invalid: No namespace used in file.">
<![CDATA[
<?php
class Bar {
}
]]>
</code>
</code_comparison>
</documentation>