backend/models/UserSearch.php

<?php
    
    namespace backend\models;
    
    use yii\base\Model;
    use yii\data\ActiveDataProvider;
    
    /**
     * UserSearch represents the model behind the search form about `backend\models\User`.
     */
    class UserSearch extends User
    {
        
        /**
         * @inheritdoc
         */
        public function rules()
        {
            return [
                [
                    [
                        'id',
                        'status',
                        'created_at',
                        'updated_at',
                    ],
                    'integer',
                ],
                [
                    [
                        'username',
                        'auth_key',
                        'password_hash',
                        'password_reset_token',
                        'email',
                    ],
                    'safe',
                ],
            ];
        }
        
        /**
         * @inheritdoc
         */
        public function scenarios()
        {
            // bypass scenarios() implementation in the parent class
            return Model::scenarios();
        }
        
        /**
         * Creates data provider instance with search query applied
         *
         * @param array $params
         *
         * @return ActiveDataProvider
         */
        public function search($params)
        {
            $query = User::find();
            
            // add conditions that should always apply here
            
            $dataProvider = new ActiveDataProvider([
                'query' => $query,
            ]);
            
            $this->load($params);
            
            if(!$this->validate()) {
                // uncomment the following line if you do not want to return any records when validation fails
                // $query->where('0=1');
                return $dataProvider;
            }
            
            // grid filtering conditions
            $query->andFilterWhere([
                'id'         => $this->id,
                'status'     => $this->status,
                'created_at' => $this->created_at,
                'updated_at' => $this->updated_at,
            ]);
            
            $query->andFilterWhere([
                'like',
                'username',
                $this->username,
            ])
                  ->andFilterWhere([
                      'like',
                      'auth_key',
                      $this->auth_key,
                  ])
                  ->andFilterWhere([
                      'like',
                      'password_hash',
                      $this->password_hash,
                  ])
                  ->andFilterWhere([
                      'like',
                      'password_reset_token',
                      $this->password_reset_token,
                  ])
                  ->andFilterWhere([
                      'like',
                      'email',
                      $this->email,
                  ]);
            
            return $dataProvider;
        }
    }