extensions/php-language-features/src/features/signatureHelpProvider.ts/PHPSignatureHelpProvider/isIdentPart
class PHPSignatureHelpProvider:	private isIdentPart(ch: number): boolean {
		if (ch === _USC || // _
			ch >= _a && ch <= _z || // a-z
			ch >= _A && ch <= _Z || // A-Z
			ch >= _0 && ch <= _9 || // 0/9
			ch >= 0x80 && ch <= 0xFFFF) { // nonascii

			return true;
		}
		return false;
	}