How do i fix this minor indent issue with vim?

If I have `:setf html` everything works as expected in the below example (the indentation matches up). say however, i have the following code (note the indent before the code), except i have it on `:setf php`. the | is the cursor ``` <div class="sig">|</div> ``` If I hit enter, it does this ``` <div class="sig"> |</div> ``` Because 99% of the time im editing php there is html in the template file, i find it kind of annoying to switch. I feel like there must be a way for vim to read markers and perhaps have multiple filetypes in one document (just like if `setf=html` it could maybe read the style tags or an inline style tag and 'know' that that little snippet in the "" is a css filetype