Remove 'rootPath' reference

#90562

extensions/php-language-features/src/features/validationProvider.ts

@@ -247,7 +247,7 @@ export default class PHPValidationProvider {
 				}
 			};
 
-			let options = vscode.workspace.rootPath ? { cwd: vscode.workspace.rootPath } : undefined;
+			let options = (vscode.workspace.workspaceFolders && vscode.workspace.workspaceFolders[0]) ? { cwd: vscode.workspace.workspaceFolders[0].uri.fsPath } : undefined;
 			let args: string[];
 			if (this.trigger === RunTrigger.onSave) {
 				args = PHPValidationProvider.FileArgs.slice(0);