Title: customizing wordpress gallery output
Last modified: October 30, 2017

---

# customizing wordpress gallery output

 *  [admin625](https://wordpress.org/support/users/admin625/)
 * (@admin625)
 * [8 years, 7 months ago](https://wordpress.org/support/topic/customizing-wordpress-gallery-output/)
 * I want to modify the default wordpress gallery and add a button below each of
   the image inside gallery.
 * I was able to extract the code from wordpress media.php file and include it in
   my function.php file.
    I need help with this part in the code:
 *     ```
       //add a button here which will be like
       $output .= <div class="custom-class" data-href="<url-of-image.png>">Like</div>;
       ```
   
 * Please help to write above in php.
    here is the Code I have included in function.
   php file:
 *     ```
       add_filter('post_gallery', 'my_post_gallery', 10, 2);
       function my_post_gallery($output, $attr) {
           global $post;
   
       $html5 = current_theme_supports( 'html5', 'gallery' );
       $atts = shortcode_atts( array(
           'order'      => 'ASC',
           'orderby'    => 'menu_order ID',
           'id'         => $post ? $post->ID : 0,
           'itemtag'    => $html5 ? 'figure'     : 'dl',
           'icontag'    => $html5 ? 'div'        : 'dt',
           'captiontag' => $html5 ? 'figcaption' : 'dd',
           'columns'    => 3,
           'size'       => 'thumbnail',
           'include'    => '',
           'exclude'    => '',
           'link'       => ''
       ), $attr, 'gallery' );
   
       $id = intval( $atts['id'] );
   
       if ( ! empty( $atts['include'] ) ) {
           $_attachments = get_posts( array( 'include' => $atts['include'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
   
           $attachments = array();
           foreach ( $_attachments as $key => $val ) {
               $attachments[$val->ID] = $_attachments[$key];
           }
       } elseif ( ! empty( $atts['exclude'] ) ) {
           $attachments = get_children( array( 'post_parent' => $id, 'exclude' => $atts['exclude'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
       } else {
           $attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
       }
   
       if ( empty( $attachments ) ) {
           return '';
       }
   
       if ( is_feed() ) {
           $output = "\n";
           foreach ( $attachments as $att_id => $attachment ) {
               $output .= wp_get_attachment_link( $att_id, $atts['size'], true ) . "\n";
           }
           return $output;
       }
   
       $itemtag = tag_escape( $atts['itemtag'] );
       $captiontag = tag_escape( $atts['captiontag'] );
       $icontag = tag_escape( $atts['icontag'] );
       $valid_tags = wp_kses_allowed_html( 'post' );
       if ( ! isset( $valid_tags[ $itemtag ] ) ) {
           $itemtag = 'dl';
       }
       if ( ! isset( $valid_tags[ $captiontag ] ) ) {
           $captiontag = 'dd';
       }
       if ( ! isset( $valid_tags[ $icontag ] ) ) {
           $icontag = 'dt';
       }
   
       $columns = intval( $atts['columns'] );
       $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
       $float = is_rtl() ? 'right' : 'left';
   
       $selector = "gallery-{$instance}";
   
       $gallery_style = '';
   
       /**
        * Filters whether to print default gallery styles.
        *
        * @since 3.1.0
        *
        * @param bool $print Whether to print default gallery styles.
        *                    Defaults to false if the theme supports HTML5 galleries.
        *                    Otherwise, defaults to true.
        */
       if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
           $gallery_style = "
           <style type='text/css'>
               #{$selector} {
                   margin: auto;
               }
               #{$selector} .gallery-item {
                   float: {$float};
                   margin-top: 10px;
                   text-align: center;
                   width: {$itemwidth}%;
               }
               #{$selector} img {
                   border: 2px solid #cfcfcf;
               }
               #{$selector} .gallery-caption {
                   margin-left: 0;
               }
               /* see gallery_shortcode() in wp-includes/media.php */
           </style>\n\t\t";
       }
   
       $size_class = sanitize_html_class( $atts['size'] );
       $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
   
       /**
        * Filters the default gallery shortcode CSS styles.
        *
        * @since 2.5.0
        *
        * @param string $gallery_style Default CSS styles and opening HTML div container
        *                              for the gallery shortcode output.
        */
       $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );
   
       $i = 0;
       foreach ( $attachments as $id => $attachment ) {
   
           $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';
           if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
               $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
           } elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
               $image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
           } else {
               $image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
           }
           $image_meta  = wp_get_attachment_metadata( $id );
   
           $orientation = '';
           if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
               $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
           }
           $output .= "<{$itemtag} class='gallery-item'>";
           $output .= "
               <{$icontag} class='gallery-icon {$orientation}'>
                   $image_output
               </{$icontag}>";
           if ( $captiontag && trim($attachment->post_excerpt) ) {
               $output .= "
                   <{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
                   " . wptexturize($attachment->post_excerpt) . "
                   </{$captiontag}>";
           }
           $output .= "</{$itemtag}>";
   
       //add a button here which will be like:
       //$output .= "<div class="custom-class" data-href="<url-of-image.png>">Like</div>";
   
           if ( ! $html5 && $columns > 0 && ++$i % $columns == 0 ) {
               $output .= '<br style="clear: both" />';
           }
       }
   
       if ( ! $html5 && $columns > 0 && $i % $columns !== 0 ) {
           $output .= "
               <br style='clear: both' />";
       }
   
       $output .= "
           </div>\n";
   
       return $output;
       }
       ```
   

The topic ‘customizing wordpress gallery output’ is closed to new replies.

## Tags

 * [gallery](https://wordpress.org/support/topic-tag/gallery/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 0 replies
 * 1 participant
 * Last reply from: [admin625](https://wordpress.org/support/users/admin625/)
 * Last activity: [8 years, 7 months ago](https://wordpress.org/support/topic/customizing-wordpress-gallery-output/)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics