yii\validators\FilterValidator::validateAttribute PHP Метод

    public function validateAttribute($model, $attribute)
    {
        $value = $model->{$attribute};
        if (!$this->skipOnArray || !is_array($value)) {
            $model->{$attribute} = call_user_func($this->filter, $value);
        }
    }

 public function testValidateAttribute()
 {
     $m = FakedValidationModel::createWithAttributes(['attr_one' => '  to be trimmed  ', 'attr_two' => 'set this to null', 'attr_empty1' => '', 'attr_empty2' => null, 'attr_array' => ['Maria', 'Anna', 'Elizabeth'], 'attr_array_skipped' => ['John', 'Bill']]);
     $val = new FilterValidator(['filter' => 'trim']);
     $val->validateAttribute($m, 'attr_one');
     $this->assertSame('to be trimmed', $m->attr_one);
     $val->filter = function ($value) {
         return null;
     };
     $val->validateAttribute($m, 'attr_two');
     $this->assertNull($m->attr_two);
     $val->filter = [$this, 'notToBeNull'];
     $val->validateAttribute($m, 'attr_empty1');
     $this->assertSame($this->notToBeNull(''), $m->attr_empty1);
     $val->skipOnEmpty = true;
     $val->validateAttribute($m, 'attr_empty2');
     $this->assertNotNull($m->attr_empty2);
     $val->filter = function ($value) {
         return implode(',', $value);
     };
     $val->skipOnArray = false;
     $val->validateAttribute($m, 'attr_array');
     $this->assertSame('Maria,Anna,Elizabeth', $m->attr_array);
     $val->skipOnArray = true;
     $val->validateAttribute($m, 'attr_array_skipped');
     $this->assertSame(['John', 'Bill'], $m->attr_array_skipped);
 }