gives the error Cannot use a variable

namespace app\controllers; use app\models\Func; use app\models\Worker; use Yii; use app\models\WorkerObject; use app\models\WorkerFunction; class AlgorithmAmicumController extends \yii\web\Controller { var $worker_id = 530; public function actionIndex() { // $this->runFileScript($this->buildScriptArray($this->worker_id)); $this->returnCache(); $cache = Yii::$app->cache; //иницализируем cache $dataProvider = json_decode($cache->get('scripts')); //забираем данные из cache return $this->render('index', [ 'dataProvider' => $dataProvider, ]); } /*функция для извлечения scripts из таблицы Func*/ public function buildScriptArray($workerId){ $workerObjects = WorkerObject::findAll(['worker_id' => $workerId]); $scripts = array(); foreach($workerObjects as $workerObject){ $scripts[$workerObject->id]['worker_object_id'] = $workerObject->id; foreach ($workerObject->workerFunctions as $workerFunction) { $scripts[$workerObject->id]['worker_object_id'][$workerFunction->id]['worker_function_id'] = $workerFunction->id; foreach ($workerFunction->function as $function) { $scripts[$workerObject->id]['worker_object_id'][$workerFunction->id]['worker_function_id'][$function->id]['function_id'] = $function->id; } } } return $scripts; } public function returnCache() { $cache = Yii::$app->cache; //инициализируем cache $forCache = $this->buildScriptArray($this->worker_id); //сливаем все в переменную $cache->set('scripts', json_encode($forCache)); //отдаем все в cache } 

gives the error Cannot use a variable

in php storm, for some reason in the foreach fragment ($ workerObject-> workerFunctions as $ workerFunction) workerFunctions does not define as part of a variable and highlights it with a different color and use app \ models \ WorkerFunction; shown as not used.

in models here are such connections

 public function getWorkerObject() { return $this->hasOne(WorkerObject::className(), ['id' => 'worker_object_id']); } public function getWorkerFunctions() { return $this->hasMany(WorkerFunction::className(), ['worker_object_id' => 'id']); } 

above is written incorrectly. error fixed below

 public function buildScriptArray($workerId){ $workerObjects = WorkerObject::findAll(['worker_id' => $workerId]); $scripts = array(); foreach($workerObjects as $workerObject){ $scripts[$workerObject->id]['worker_object_id'] = $workerObject->id; foreach ($workerObject->workerFunctions as $workerFunction) { $scripts[$workerObject->id]['worker_object'][$workerFunction->id]['worker_function_id'] = $workerFunction->id; foreach ($workerFunction->function as $function) { $scripts[$workerObject->id]['worker_object'][$workerFunction->id]['worker_function'][$function->id]['function_id'] = $function->id; } } }