I use this kind of highlighting: 
This helps me a lot when php code along with other html code.
You have to edit your theme .tmTheme file since my Monokay.tmTheme so right after the command </array>I used the code above:
<dict>
<key>scope</key>
<string>punctuation.section.embedded.begin.php</string>
<key>settings</key>
<dict>
<key>foreground</key>
<string>#FF0000</string>
</dict>
</dict>
<dict>
<key>scope</key>
<string>punctuation.section.embedded.end.php</string>
<key>settings</key>
<dict>
<key>foreground</key>
<string>#FF0000</string>
</dict>
</dict>