public function suggestionForContentsOnTheBasisOfUserLikesAndDislikes()
{
$current_user = \Yii::$app->user->identity->getId();
$allModels = ContentRecord::find()->all();
$allModelsIds = ArrayHelper::getColumn($allModels, 'id');
//$modelsIds=ArrayHelper::getColumn($models,'id');
$modelsToBeComputedIds = array_diff($allModelsIds, []);
//$modelsIds);
//$l1 is all Contents Liked By Current User
$likedByCurrentUser = LikeDislikeContent::find()->where(['likeOrDislike' => 1, 'likedOrDislikedBy' => $current_user])->all();
$l1 = ArrayHelper::getColumn($likedByCurrentUser, 'content');
//$d1 is all Contents Disliked By Current User
$dislikedByCurrentUser = LikeDislikeContent::find()->where(['likeOrDislike' => 0, 'likedOrDislikedBy' => $current_user])->all();
$d1 = ArrayHelper::getColumn($dislikedByCurrentUser, 'content');
$arrayOfProbability = [];
foreach ($modelsToBeComputedIds as $id) {
$likedRecords = LikeDislikeContent::find()->where(['likeOrDislike' => 1, 'content' => $id])->all();
$likerUsersIds = ArrayHelper::getColumn($likedRecords, 'likedOrDislikedBy');
//all users liking the content
$dislikedRecords = LikeDislikeContent::find()->where(['likeOrDislike' => 0, 'content' => $id])->all();
$dislikerUsersIds = ArrayHelper::getColumn($dislikedRecords, 'likedOrDislikedBy');
//all users disliking the content
//zl is sum of similarities between likers and current user
$zl = 0;
foreach ($likerUsersIds as $likerUsersId) {
//$l2 is all Contents Liked By This User
$likedByUser = LikeDislikeContent::find()->where(['likeOrDislike' => 1, 'likedOrDislikedBy' => $likerUsersId])->all();
$l2 = ArrayHelper::getColumn($likedByUser, 'content');
//$d2 is all Contents Disliked By This User
$dislikedByUser = LikeDislikeContent::find()->where(['likeOrDislike' => 0, 'likedOrDislikedBy' => $likerUsersId])->all();
$d2 = ArrayHelper::getColumn($dislikedByUser, 'content');
$l1Intersectl2 = count(array_intersect($l1, $l2));
$d1Intersectd2 = count(array_intersect($d1, $d2));
$l1Intersectd2 = count(array_intersect($l1, $d2));
$l2Intersectd1 = count(array_intersect($l2, $d1));
$l1Ul2Ud1Ud2 = count(array_unique(array_merge($l1, $l2, $d1, $d2)));
//$s is similarity index Between Current User And This User
$s = ($l1Intersectl2 + $d1Intersectd2 - $l1Intersectd2 - $l2Intersectd1) / $l1Ul2Ud1Ud2;
$zl += $s;
}
//zd is sum of similarities between dislikers and current user
$zd = 0;
foreach ($dislikerUsersIds as $dislikerUsersId) {
//$l2 is all Contents Liked By This User
$likedByUser = LikeDislikeContent::find()->where(['likeOrDislike' => 1, 'likedOrDislikedBy' => $dislikerUsersId])->all();
$l2 = ArrayHelper::getColumn($likedByUser, 'content');
//$d2 is all Contents Disliked By This User
$dislikedByUser = LikeDislikeContent::find()->where(['likeOrDislike' => 0, 'likedOrDislikedBy' => $dislikerUsersId])->all();
$d2 = ArrayHelper::getColumn($dislikedByUser, 'content');
$l1Intersectl2 = count(array_intersect($l1, $l2));
$d1Intersectd2 = count(array_intersect($d1, $d2));
$l1Intersectd2 = count(array_intersect($l1, $d2));
$l2Intersectd1 = count(array_intersect($l2, $d1));
$l1Ul2Ud1Ud2 = count(array_unique(array_merge($l1, $l2, $d1, $d2)));
//$s is similarity index Between Current User And This User
$s = ($l1Intersectl2 + $d1Intersectd2 - $l1Intersectd2 - $l2Intersectd1) / $l1Ul2Ud1Ud2;
$zd += $s;
}
$totalCount = count($likerUsersIds) + count($dislikerUsersIds);
if ($totalCount == 0) {
$p = -100;
} else {
$p = ($zl - $zd) / $totalCount;
}
$arrayOfProbability[$id] = $p;
}
arsort($arrayOfProbability);
$models = [];
foreach (array_keys($arrayOfProbability) as $id) {
$content = ContentRecord::findOne($id);
array_push($models, $content);
}
return $models;
}
public function actionViewsingle($id)
{
$model = ContentRecord::findOne($id);
return $this->render('singlecontent', ['model' => $model]);
}
