$user = User::findOne(['id' => 1]);
$user = User::findOne(['email' => 'example@example.com']);In this example, the `findOne` method is used to find a user with the email address of `example@example.com`. The condition passed to the method is an array with the key of `email` and the value of `example@example.com`. This example assumes that the `User` model has a database table with an `email` column. The `findOne` method is commonly used in PHP frameworks such as Yii2 and Laravel's Eloquent ORM. Package/Library: ActiveRecord.