syn match phpinterpSimpleBracketsInner "\w\+" contained
syn match phpInterpSimpleBrackets "\[\h\w*]" contained contains=phpBrackets,phpInterpSimpleBracketsInner
syn match phpInterpSimpleBrackets "\[\d\+]" contained contains=phpBrackets,phpInterpSimpleBracketsInner
syn match phpinterpSimpleBracketsInner "\w\+" contained
syn match phpInterpSimpleBrackets "\[\h\w*]" contained contains=phpBrackets,phpInterpSimpleBracketsInner
syn match phpInterpSimpleBrackets "\[\d\+]" contained contains=phpBrackets,phpInterpSimpleBracketsInner