Social share button widget for Wordpress

social_widget.php

<?php 


/************************** */
// social media sharing button
/************************** */
//creao una widget area
function tdm_social_post_widgets_init() {
    register_sidebar( array(
        'name' => __( 'Social in post', 'tdm_social' ),
        'id' => 'tdm_social',
        'before_widget' => '<div class="tdm-social-area">',
        'after_widget' => '</div>',
        'before_title' => '<h1>',
        'after_title' => '</h1>',
    ) );
}
add_action( 'widgets_init', 'tdm_social_post_widgets_init' );


class tdm_social extends WP_Widget {

function tdm_social() {
    $widget_ops = array( 'classname' => 'tdm_social', 'description' => __( 'TDM Social', 'wptheme' ) );
    $this->WP_Widget( 'tdm_social', __( 'TDM Social', 'wptheme' ), $widget_ops, $control_ops );
}

function widget( $args, $instance ) {
    extract( $args );
    $title = apply_filters( 'widget_title', $instance[ 'title' ] );

    // The following variable is for a checkbox option type
    $Facebook = $instance[ 'Facebook' ] ? 'true' : 'false';
    $Twitter = $instance[ 'twitter' ] ? 'true' : 'false';
    $Buffer = $instance[ 'Buffer' ] ? 'true' : 'false';
    $LinkedIn = $instance[ 'LinkedIn' ] ? 'true' : 'false';
    $Pinterest = $instance[ 'Pinterest' ] ? 'true' : 'false';

    echo $before_widget;

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

        // Get current page URL 
        $tdmURL = urlencode(get_permalink());
        
        // Get current page title
        $tdmTitle = htmlspecialchars(urlencode(html_entity_decode(get_the_title(), ENT_COMPAT, 'UTF-8')), ENT_COMPAT, 'UTF-8');
        // $tdmTitle = str_replace( ' ', '%20', get_the_title());

        // Get Post Thumbnail for pinterest
        $tdmThumbnail = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full' );

        // Construct sharing URL without using any script
        $twitterURL = 'https://twitter.com/intent/tweet?text='.$tdmTitle.'&amp;url='.$tdmURL.'&amp;via=treehost.eu';
        $facebookURL = 'https://www.facebook.com/sharer/sharer.php?u='.$tdmURL;
        $bufferURL = 'https://bufferapp.com/add?url='.$rdmURL.'&amp;text='.$tdmTitle;
        $linkedInURL = 'https://www.linkedin.com/shareArticle?mini=true&url='.$tdmURL.'&amp;title='.$tdmTitle;
        $pinterestURL = 'https://pinterest.com/pin/create/button/?url='.$rdmURL.'&amp;media='.$tdmThumbnail[0].'&amp;description='.$tdmTitle;

        // Retrieve the checkbox

        // Add sharing button at the end of page/page content

        $variable .= '<div class="tdm-social-social">';
        if( 'on' == $instance[ 'Facebook' ] ) {
        $variable .= '<a class="tdm-social-link tdm-facebook" href="'.$facebookURL.'" target="_blank">Facebook</a>';
        }
        if( 'on' == $instance[ 'twitter' ] ) {
        $variable .= '<a class="tdm-social-link tdm-twitter" href="'. $twitterURL .'" target="_blank">Twitter</a>';
        }
        if( 'on' == $instance[ 'Buffer' ] ) {
        $variable .= '<a class="tdm-social-link tdm-buffer" href="'.$bufferURL.'" target="_blank">Buffer</a>';
        }
        if( 'on' == $instance[ 'LinkedIn' ] ) {
        $variable .= '<a class="tdm-link tdm-linkedin" href="'.$linkedInURL.'" target="_blank">LinkedIn</a>';
        }
        if( 'on' == $instance[ 'Pinterest' ] ) {
        $variable .= '<a class="tdm-link tdm-pinterest" href="'.$pinterestURL.'" data-pin-custom="true" target="_blank">Pinterest</a>';
        $variable .= '</div>';
        }
        echo $variable;
        ?>
        <?php 
    echo $after_widget;
}

function update( $new_instance, $old_instance ) {
    $instance = $old_instance;
    $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] );

    // The update for the variable of the checkbox
    
    $instance[ 'Facebook' ] = $new_instance[ 'Facebook' ];
    $instance[ 'twitter' ] = $new_instance[ 'twitter' ];
    $instance[ 'Buffer' ] = $new_instance[ 'Buffer' ];
    $instance[ 'LinkedIn' ] = $new_instance[ 'LinkedIn' ];
    $instance[ 'Pinterest' ] = $new_instance[ 'Pinterest' ];
    return $instance;
}

function form( $instance ) {
    $defaults = array( 'title' => __( ' ', 'wptheme' ), 'Facebook' => 'off', 'twitter' => 'off', 'Buffer' => 'off', 'LinkedIn' => 'off', 'Pinterest' => 'off' );
    $instance = wp_parse_args( ( array ) $instance, $defaults ); ?>
    <p>
        <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title</label>
        <input class="widefat"  id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance[ 'title' ] ); ?>" />
    </p>
    <!-- The checkbox -->
    <p>

        <label> Scegli i network su cui condividere:</label><br> 

        <input class="checkbox" type="checkbox" <?php checked( $instance[ 'Facebook' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'Facebook' ); ?>" name="<?php echo $this->get_field_name( 'Facebook' ); ?>" /> Facebook<br>

        <input class="checkbox" type="checkbox" <?php checked( $instance[ 'twitter' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'twitter' ); ?>" name="<?php echo $this->get_field_name( 'twitter' ); ?>" /> twitter<br>

        <input class="checkbox" type="checkbox" <?php checked( $instance[ 'Buffer' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'Buffer' ); ?>" name="<?php echo $this->get_field_name( 'Buffer' ); ?>" /> Buffer<br>

        <input class="checkbox" type="checkbox" <?php checked( $instance[ 'LinkedIn' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'LinkedIn' ); ?>" name="<?php echo $this->get_field_name( 'LinkedIn' ); ?>" /> LinkedIn<br>

        <input class="checkbox" type="checkbox" <?php checked( $instance[ 'Pinterest' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'Pinterest' ); ?>" name="<?php echo $this->get_field_name( 'Pinterest' ); ?>" /> Pinterest<br>

    </p>

<?php
}

}
register_widget( 'tdm_social' );