Simple "Blog info" Widget snippet for WordPress. Not very good, but it's a test =)

widget.php

<?php
/**
 * Simple "blog info" widget snippet
 * @todo      rebuild it =)
 * @author    Kevin Legrand : http://k-legrand.fr
 * @copyright Copyright (c) 2014, Kevin Legrand
 * @link      http://k-legrand.fr
 * @license   http://www.gnu.org/licenses/gpl-3.0.html
*/

// The prefix 'AM' mean "AntiMony", a theme I built
add_action( 'widgets_init', array( 'AM_Blog_Infos', 'register_bloginfo' ) );
class AM_Blog_Infos extends WP_Widget {

    function __construct() {
        parent::__construct(
            'am_blog_info', // Widget ID
            __( 'AM Blog info - Footer', 'antimony' ), // Widget name
            array(
                'classname'   => 'am-blog-info',
                'description' => __( 'A simple About widget with social media links for your footer.', 'antimony' )
            )
        );
    }

    // I think this method is not very good. I'll rethink it, one day ...
    public static function register_bloginfo() {
        register_widget( 'AM_Blog_Infos' );
    }

    // Build the front stuff
    function widget( $args, $instance ) {
        extract( $args );

        $title = apply_filters(
            'widget_title',
            empty( $instance['title'] ) ?
                __( 'About me', 'antimony' ) :
                $instance['title']
        );
        $text  = $instance['text'];
        $check = $instance['check'];
        $rss   = $instance['rss'];
        $fb    = $instance['fb'];
        $tw    = $instance['tw'];
        $insta = $instance['insta'];
        $dribb = $instance['dribb'];
        $pin   = $instance['pin'];
        $gplus = $instance['gplus'];

        echo $before_widget;

        if( $title ) echo $before_title . $title . $after_title;

        // A better way is to include all the html content into another file.
        // Ex: include( plugin_dir_path( __FILE__ ).'/front-bloginfo.php' ); ?>

        <p>
            <?php echo $text; ?>
        </p>

        <?php

        if( $check != 'on' ) { ?>

        <ul>
            <?php if($rss != '') { ?>

            <li><a class="bi-rss" href="<?php echo $rss; ?>" target="_blank"><i class="icon-rss"></i></a></li>
            <?php } if($fb != '') { ?>

            <li><a class="bi-fb" href="<?php echo $fb; ?>" target="_blank"><i class="icon-facebook"></i></a></li>
            <?php } if($tw != '') { ?>

            <li><a class="bi-tw" href="<?php echo $tw; ?>" target="_blank"><i class="icon-twitter"></i></a></li>
            <?php } if($insta != '') { ?>

            <li><a class="bi-insta" href="<?php echo $insta; ?>" target="_blank"><i class="icon-instagram"></i></a></li>
            <?php } if($dribb != '') { ?>

            <li><a class="bi-dribb" href="<?php echo $dribb; ?>" target="_blank"><i class="icon-dribbble"></i></a></li>
            <?php } if($pin != '') { ?>

            <li><a class="bi-pin" href="<?php echo $pin; ?>" target="_blank"><i class="icon-pinterest"></i></a></li>
            <?php } if($gplus != '') { ?>

            <li><a class="bi-gplus" href="<?php echo $gplus; ?>" target="_blank"><i class="icon-gplus"></i></a></li>
            <?php } ?>

        </ul>

        <?php } ?>

        <?php echo $after_widget;
    }

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;

        $instance['title'] = strip_tags( $new_instance['title'] );
        $instance['text']  = $new_instance['text'];
        $instance['check'] = $new_instance['check'];
        $instance['rss']   = $new_instance['rss'];
        $instance['fb']    = $new_instance['fb'];
        $instance['tw']    = $new_instance['tw'];
        $instance['insta'] = $new_instance['insta'];
        $instance['dribb'] = $new_instance['dribb'];
        $instance['pin']   = $new_instance['pin'];
        $instance['gplus'] = $new_instance['gplus'];

        return $instance;
    }

    // Build the admin form
    function form( $instance ) {

        $defaults = array(
            'title' => __( 'About me', 'antimony' ),
            'text'  => __( 'You can add some content here about your blog or about you.', 'antimony' ),
            'check' => '',
            'rss'   => 'http://www.your-url.com/feed',
            'fb'    => 'http://www.facebook.com/lboldair',
            'tw'    => 'http://www.twitter.com/Manoz',
            'insta' => 'http://instagram.com/manoz_',
            'dribb' => 'http://dribbble.com/Manoz',
            'pin'   => 'http://www.pinterest.com/manoz/',
            'gplus' => 'https://plus.google.com/+KvinLegrand/posts'
        );

        $instance = wp_parse_args( (array) $instance, $defaults ); 

        // A better way is to include all the html content into another file.
        // Ex: include( plugin_dir_path( __FILE__ ).'/admin-bloginfo.php' ); ?>

        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'antimony' ) ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" />
        </p>

        <p>
            <label for="<?php echo $this->get_field_id( 'text' ); ?>"><?php _e( 'Widget content:', 'antimony' ); ?></label>
            <textarea class="widefat" rows="8" cols="20" id="<?php echo $this->get_field_id( 'text' ); ?>" name="<?php echo $this->get_field_name( 'text' ); ?>"><?php echo $instance['text']; ?></textarea>
        </p>

        <p>
            <input class="checkbox" type="checkbox" <?php checked( $instance['check'], 'on' ); ?> id="<?php echo $this->get_field_id( 'check' ); ?>" name="<?php echo $this->get_field_name( 'check' ); ?>" />
            <label for="<?php echo $this->get_field_id( 'check' ); ?>"><?php _e( 'Hide social links?', 'antimony' ); ?></label>
        </p>
        <!-- RSS -->
        <p>
            <label for="<?php echo $this->get_field_id( 'rss' ); ?>"><?php _e( 'RSS URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'rss' ); ?>" name="<?php echo $this->get_field_name( 'rss' ); ?>" type="text" value="<?php echo $instance['rss']; ?>" />
        </p>

        <!-- Facebook -->
        <p>
            <label for="<?php echo $this->get_field_id( 'fb' ); ?>"><?php _e( 'Facebook URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'fb' ); ?>" name="<?php echo $this->get_field_name( 'fb' ); ?>" type="text" value="<?php echo $instance['fb']; ?>" />
        </p>

        <!-- Twitter -->
        <p>
            <label for="<?php echo $this->get_field_id( 'tw' ); ?>"><?php _e( 'Twitter URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'tw' ); ?>" name="<?php echo $this->get_field_name( 'tw' ); ?>" type="text" value="<?php echo $instance['tw']; ?>" />
        </p>

        <!-- Instagram -->
        <p>
            <label for="<?php echo $this->get_field_id( 'insta' ); ?>"><?php _e( 'Instagram URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'insta' ); ?>" name="<?php echo $this->get_field_name( 'insta' ); ?>" type="text" value="<?php echo $instance['insta']; ?>" />
        </p>

        <!-- Dribbble -->
        <p>
            <label for="<?php echo $this->get_field_id( 'dribb' ); ?>"><?php _e( 'Dribbble URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'dribb' ); ?>" name="<?php echo $this->get_field_name( 'dribb' ); ?>" type="text" value="<?php echo $instance['dribb']; ?>" />
        </p>

        <!-- Pinterest -->
        <p>
            <label for="<?php echo $this->get_field_id( 'pin' ); ?>"><?php _e( 'Pinterest URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'pin' ); ?>" name="<?php echo $this->get_field_name( 'pin' ); ?>" type="text" value="<?php echo $instance['pin']; ?>" />
        </p>

        <!-- Google+ -->
        <p>
            <label for="<?php echo $this->get_field_id( 'gplus' ); ?>"><?php _e( 'Google+ URL:', 'antimony' ); ?></label>
            <input class="widefat" id="<?php echo $this->get_field_id( 'gplus' ); ?>" name="<?php echo $this->get_field_name( 'gplus' ); ?>" type="text" value="<?php echo $instance['gplus']; ?>" />
        </p>

    <?php }

}