config/sublime/Packages/PHP/php.sublime-snippet

<snippet>
    <content><![CDATA[<?${TM_PHP_OPEN_TAG:php} $0 ?>]]></content>
    <tabTrigger>php</tabTrigger>
    <scope>text.html - source.php</scope>
    <description>&lt;?php … ?&gt;</description>
</snippet>