VS Code does (did?) detect embedded SQL in PHP and correctly colour it, but only if it's on a single line. Any linebreaks and the colour is turned off. Also, if you're using prepared statements and have an @label, and that label is at the end of the string (so immediately followed by a closing quote), the SQL colouring continues into the rest of the PHP beyond the string. So it's important that single-line SQL statements ending in a @label be edited into multi-line statements to turn off the broken SQL colouring. Odd.