No syntax highlighting when concatenating a string since 2017.1
Answered
Since upgrading to 2017.1, I lost PHP syntax highlighting when concatenating with a string. See the attached image

Normally $value['first_name'] .' '. $value['last_name'] would have syntax highlighting.
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Hi there,
https://youtrack.jetbrains.com/issue/WI-35775 -- It's already resolved for the next update (2017.1.2)
You can find workaround in that ticket:
Open Settings | Editor | Colors and Fonts | PHP | Concatenations and uncheck all (3 ticked) options checkboxes