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if(!function_exists('pinterest_share_url'))
{
    function pinterest_share_url ($url, $media, $desc, $link_text = '', $attributes = array(), $popup = TRUE)
    {
        $url = htmlentities($url);
        $media = htmlentities($media);
        $desc = htmlentities($desc);
        $share_url = 'http://www.pinterest.com/pin/create/button/?url='.$url.'&media='.$media.'&description='.$desc;

        if (empty ($attributes['href']))
            $attributes['href'] = $share_url;

        if ($popup !== FALSE)
        {
            $default_settings = array('name' => 'Pinterest', 'width' => 780, 'height' => 360);
            $window_settings = (is_array ($popup))
                ? array_merge ($default_settings, $popup)
                : $default_settings;

            $window_name = $window_settings['name'];
            unset ($window_settings['name']);
            $window_features = array();
            foreach ($window_settings as $k => $v)
                $window_features [] = htmlentities ($k).'='.htmlentities ($v);
            $window_features = implode (',', $window_features);
            $window = array($share_url, $window_name);
            if (!empty ($window_features))
                $window[] = $window_features;

            $window = 'window.open(\''.implode('\',\'', $window).'\');';

            if (empty ($attributes['onclick']))
                $attributes['onclick'] = $window.' return false;';
            else
            {
                $attributes['onclick'] = (preg_match ('\/s*return\s+false;\s*$/i', $attributes['onclick']))
                    ? preg_replace ('\/s*return\s+false;\s*$/i', ' '.$window.' return false;', $attributes['onclick'])
                    : $attributes['onclick'].' '.$window.' return false';
            }
        }

        $_attributes = array();
        foreach ($attributes as $k => $v)
            $_attributes [] = $k.'="'.htmlentities ($v).'"';

        return '<a '.implode (' ', $_attributes).'><i class="icon-pinterest"></i> '.$link_text.'</a>';
    }
}

function mf_social_shares($id){
  $pintrest = pinterest_share_url( $url, wp_get_attachment_image_src( get_post_thumbnail_id( $id ), 'single-post-thumbnail' )[0], get_permalink($id), 'SHARE ON PINTREST', array('id' => 'pinterest-share', 'class' => 'btn btn-box pinterest'));
  echo $pintrest;
}

add_action('mf_social_shares', 'mf_social_shares', 1);

<?php do_action('mf_social_shares', $post->ID ); ?>