extensions/php-language-features/src/features/signatureHelpProvider.ts/PHPSignatureHelpProvider/readIdent
class PHPSignatureHelpProvider:	private readIdent(iterator: BackwardIterator): string {
		let identStarted = false;
		let ident = '';
		while (iterator.hasNext()) {
			const ch = iterator.next();
			if (!identStarted && (ch === _WSB || ch === _TAB || ch === _NL)) {
				continue;
			}
			if (this.isIdentPart(ch)) {
				identStarted = true;
				ident = String.fromCharCode(ch) + ident;
			} else if (identStarted) {
				return ident;
			}
		}
		return ident;
	}