Can't find how to disable/change background color for object variable
已回答

I've clicked through all of the colors in PHP under File > Settings > Editor > Color Scheme > PHP, not seeing the setting.
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Hi there,
Background color? That looks like you have got an inspection warning there ... so look for Warning style (hint: use handy search box in Settings screen).
I do not think it has any relation to "object variable" (but that may depend on the color schema that you are using).
Also it may be easier to use Jump to Colors and Fonts : https://blog.jetbrains.com/phpstorm/2017/08/jump-to-colors-and-fonts-in-phpstorm/