public function viewport($content = null)
    {
        if (empty($content)) {
            $content = 'width=device-width, initial-scale=1.0';
        }
        if (is_array($content)) {
            $content = implode(', ', $content);
        }
        return $this->meta(array('name' => 'viewport', 'content' => $content));
    }
public function viewport($content = null)
    {
        if (empty($content)) {
            $content = 'width=device-width, initial-scale=1.0';
        }
        if (is_array($content)) {
            $content = implode(', ', $content);
        }
        return $this->meta(array('name' => 'viewport', 'content' => $content));
    }
public function viewport ( $ content = null ) { if ( empty ( $ content ) ) { $ content = 'width=device-width, initial-scale=1.0' ; } if ( is_array ( $ content ) ) { $ content = implode ( ', ' , $ content ) ; } return $ this -> meta ( array ( 'name' => 'viewport' , 'content' => $ content ) ) ; }
Viewport meta.

@param mixed $content
@return string
Viewport meta .