src/Helpers/Request/HtmlHelper.php
public function errorSummary($models, $options = [], $encoding = null)
    {
        return $this->proxyWithCharset(__FUNCTION__, [$models, $options, $encoding]);
    }
public function errorSummary($models, $options = [], $encoding = null)
    {
        return $this->proxyWithCharset(__FUNCTION__, [$models, $options, $encoding]);
    }
Generates a summary of the validation errors.
If there is no validation error, an empty error summary markup will still be generated, but it will be hidden.
@param Model|Model[] $models the model(s) whose validation errors are to be displayed.
@param array         $options the tag options in terms of name-value pairs. The following options are specially handled:

- header: string, the header HTML for the error summary. If not set, a default prompt string will be used.
- footer: string, the footer HTML for the error summary. Defaults to empty string.
- encode: boolean, if set to false then the error messages won't be encoded. Defaults to `true`.
- showAllErrors: boolean, if set to true every error message for each attribute will be shown otherwise
only the first error message for each attribute will be shown. Defaults to `false`.
Option is available since 2.0.10.

The rest of the options will be rendered as the attributes of the container tag.

@param string        $encoding
@return string the generated error summary
@see Html::errorSummary()