src/helpers/Element.php
public static function iconButton($glyph, $options = [])
    {
        $iOptions = ArrayHelper::remove($options, 'icon', []);
        Ui::addCssClasses($options, ['icon']);
        return static::button(static::icon($glyph, $iOptions), $options);
    }
public static function iconButton($glyph, $options = [])
    {
        $iOptions = ArrayHelper::remove($options, 'icon', []);
        Ui::addCssClasses($options, ['icon']);
        return static::button(static::icon($glyph, $iOptions), $options);
    }
Generates an [icon button](http://semantic-ui.com/elements/button.html#icon)

@param string $glyph the glyphicon name to be used -ie "cloud"
@param array $options the tag options in terms of name-value pairs. These will be rendered as
the attributes of the resulting tag. The values will be HTML-encoded using [[encode()]].

@return string the generated icon button tag