Highligt Compiler Optimized Functions

There are some PHP functions that the PHP compiler can optimize to a more efficient opcode-based representation

Would be nice to kind of highlight them or at least adding a hint in tool tip and suggestion list.

weissersand, thank you for the suggestion.

We'll add a diagnostic for those special functions being used incorrectly (disallowing further op code optimizations).

I'll write a blog and docs how to take advantage of it, but basically I suggest allowing:

They have a quickfix, and are highlighted as a hint (three dots). This can be marked as a warning or error with the following .editorconfig:

[*.php]
php_diagnostic_php6616=error

Preparing a blog post with details. Thank you again for the suggestion!