aclass.sublime-snippet

<snippet>
    <content><![CDATA[
namespace ${1}

abstract class ${2:ClassName}
{
    ${3}
}

]]></content>
    <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
    <tabTrigger>aclass</tabTrigger>
    <!-- Optional: Set a scope to limit where the snippet will trigger -->
    <scope>source.php</scope>
</snippet>