Connecting Wordpress gallery to custom categories (taxonomy)

I want to use the Wordpress gallery to show all pictures of one category in a gallery (on a fixed page), which I do not have to update all the time by inserting the pictures manually.

So I added the category feature into media with this function:

function is_add_categories_to_attachments() {
register_taxonomy_for_object_type( 'category', 'attachment' );
}
add_action( 'init' , 'is_add_categories_to_attachments' );

Great, that worked. In the media menu I can add as many categories I want to now. In my case I made three of them, named alpha, beta and gamma.

Then I wanted to post a gallery on a fixed page with one category:

[gallery type="squares" category="alpha" order="DESC" orderby="ID" link="file"]

But that did not work and I had to use the post_gallery filter in my child's functions.php, so that I can change the code there, but I have absolutely NO CLUE how to enter the category recognisation into that gallery_shortcut:

function is_gallery($output, $attr) {
$post = get_post();

static $instance = 0;
$instance++;

if ( ! empty( $attr['ids'] ) ) {
    // 'ids' is explicitly ordered, unless you specify otherwise.
    if ( empty( $attr['orderby'] ) )
        $attr['orderby'] = 'post__in';
    $attr['include'] = $attr['ids'];
}

// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
    return $output;

// We're trusting author input, so let's at least make sure it looks like a valid orderby statement
if ( isset( $attr['orderby'] ) ) {
    $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
    if ( !$attr['orderby'] )
        unset( $attr['orderby'] );
}

extract(shortcode_atts(array(
    'order'      => 'ASC',
    'orderby'    => 'menu_order ID',
    'id'         => $post ? $post->ID : 0,
    'itemtag'    => 'dl',
    'icontag'    => 'dt',
    'captiontag' => 'dd',
    'columns'    => 3,
    'size'       => 'thumbnail',
    'include'    => '',
    'exclude'    => '',
    'link'       => ''
), $attr, 'gallery'));

$id = intval($id);
if ( 'RAND' == $order )
    $orderby = 'none';

if ( !empty($include) ) {
    $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

    $attachments = array();
    foreach ( $_attachments as $key => $val ) {
        $attachments[$val->ID] = $_attachments[$key];
    }
} elseif ( !empty($exclude) ) {
    $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
} else {
    $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
}

if ( empty($attachments) )
    return '';

if ( is_feed() ) {
    $output = "\n";
    foreach ( $attachments as $att_id => $attachment )
        $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
    return $output;
}

$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$icontag = tag_escape($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';

$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
$float = is_rtl() ? 'right' : 'left';

$selector = "gallery-{$instance}";

$gallery_style = $gallery_div = '';
if ( apply_filters( 'use_default_gallery_style', true ) )
    $gallery_style = "
    <style type='text/css'>
        #{$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>";
$size_class = sanitize_html_class( $size );
$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

$i = 0;
foreach ( $attachments as $id => $attachment ) {
    if ( ! empty( $link ) && 'file' === $link )
        $image_output = wp_get_attachment_link( $id, $size, false, false );
    elseif ( ! empty( $link ) && 'none' === $link )
        $image_output = wp_get_attachment_image( $id, $size, false );
    else
        $image_output = wp_get_attachment_link( $id, $size, true, false );

    $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'>
            " . wptexturize($attachment->post_excerpt) . "
            </{$captiontag}>";
    }
    $output .= "</{$itemtag}>";
    if ( $columns > 0 && ++$i % $columns == 0 )
        $output .= '<br style="clear: both" />';
}

$output .= "
        <br style='clear: both;' />
    </div>\n";

return $output;
}
add_filter("post_gallery", "is_gallery",10,2);

Can you show me how to insert the category feature into the galley_shortcode?

Thank you in advance.

Would that be correct then?

function is_gallery($output, $attr) {
$post = get_post();

static $instance = 0;
$instance++;

if ( ! empty( $attr['ids'] ) ) {
// 'ids' is explicitly ordered, unless you specify otherwise.
if ( empty( $attr['orderby'] ) )
    $attr['orderby'] = 'post__in';
$attr['include'] = $attr['ids'];
}

// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
return $output;

// We're trusting author input, so let's at least make sure it looks like a valid     orderby statement
if ( isset( $attr['orderby'] ) ) {
$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
if ( !$attr['orderby'] )
    unset( $attr['orderby'] );
}

extract(shortcode_atts(array(
'order'      => 'ASC',
'orderby'    => 'menu_order ID',
'id'         => $post ? $post->ID : 0,
'itemtag'    => 'dl',
'icontag'    => 'dt',
'captiontag' => 'dd',
'columns'    => 3,
'size'       => 'thumbnail',
'include'    => '',
'exclude'    => '',
'link'       => ''
), $attr, 'gallery'));

$id = intval($id);
if ( 'RAND' == $order )
$orderby = 'none';

$beta_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'beta', // note: use category SLUG
) );

$beta_id_array = array();
foreach ( $beta_attachments as $beta ) {
$beta_id_array[] = $beta->ID;
}
$beta_ids = implode( ',', $beta_id_array );

$gamma_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'gamma', // note: use category SLUG
) );

$gamma_id_array = array();
foreach ( $gamma_attachments as $gamma ) {
$gamma_id_array[] = $gamma->ID;
}
$gamma_ids = implode( ',', $gamma_id_array );

$alpha_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'alpha', // note: use category SLUG
) );

$alpha_id_array = array();
foreach ( $alpha_attachments as $alpha ) {
$alpha_id_array[] = $alpha->ID;
}
$alpha_ids = implode( ',', $alpha_id_array );

if ( !empty($include) ) {
$_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

$attachments = array();
foreach ( $_attachments as $key => $val ) {
    $attachments[$val->ID] = $_attachments[$key];
}
} elseif ( !empty($exclude) ) {
$attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
} else {
$attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
}

if ( empty($attachments) )
return '';

if ( is_feed() ) {
$output = "\n";
foreach ( $attachments as $att_id => $attachment )
    $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
return $output;
}

$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$icontag = tag_escape($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';

$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
$float = is_rtl() ? 'right' : 'left';

$selector = "gallery-{$instance}";

$gallery_style = $gallery_div = '';
if ( apply_filters( 'use_default_gallery_style', true ) )
$gallery_style = "
<style type='text/css'>
    #{$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>";
$size_class = sanitize_html_class( $size );
$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

$i = 0;
foreach ( $attachments as $id => $attachment ) {
if ( ! empty( $link ) && 'file' === $link )
    $image_output = wp_get_attachment_link( $id, $size, false, false );
elseif ( ! empty( $link ) && 'none' === $link )
    $image_output = wp_get_attachment_image( $id, $size, false );
else
    $image_output = wp_get_attachment_link( $id, $size, true, false );

$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'>
        " . wptexturize($attachment->post_excerpt) . "
        </{$captiontag}>";
}
$output .= "</{$itemtag}>";
if ( $columns > 0 && ++$i % $columns == 0 )
    $output .= '<br style="clear: both" />';
}

$output .= "
    <br style='clear: both;' />
</div>\n";

return $output;
}
add_filter("post_gallery", "is_gallery",10,2);

Update

hi Chip,

I understood your idea/solution now and tried it (well, copied it over thanks to you). I think the logic is working, but in practise use it does not. I used the code like that and it does not "see" the categories. Therefore it just shows an empty content (below navigation, of course).

people.php:

 <?php
 /**
 * Template Name: People Gallery
 */

 get_header(); ?>

<?php

$people_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'people', // note: use category SLUG
) );

$people_id_array = array();

if ( $people_attachments->have_posts() ) : while ( $people_attachments->have_posts() ) : $people_attachments->the_post();

$people_id_array[] = get_the_ID();

endwhile; endif;
// Important!
wp_reset_postdata();

$people_ids = implode( ',', $people_id_array );

echo do_shortcode( '[gallery link="file" columns="5" order="DESC" orderby="ID" include="' . $people_ids . '"]' );

?>

<?php var_dump( $people_id_array ); ?>

<?php // get_sidebar(); ?>

<?php get_footer(); ?>

Working now

I want to use the Wordpress gallery to show all pictures of one category in a gallery (on a fixed page), which I do not have to update all the time by inserting the pictures manually.

So I added the category feature into media with this function:

function is_add_categories_to_attachments() {
register_taxonomy_for_object_type( 'category', 'attachment' );
}
add_action( 'init' , 'is_add_categories_to_attachments' );

Great, that worked. In the media menu I can add as many categories I want to now. In my case I made three of them, named alpha, beta and gamma.

Then I wanted to post a gallery on a fixed page with one category:

[gallery type="squares" category="alpha" order="DESC" orderby="ID" link="file"]

function is_gallery($output, $attr) {
$post = get_post();

static $instance = 0;
$instance++;

if ( ! empty( $attr['ids'] ) ) {
    // 'ids' is explicitly ordered, unless you specify otherwise.
    if ( empty( $attr['orderby'] ) )
        $attr['orderby'] = 'post__in';
    $attr['include'] = $attr['ids'];
}

// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
    return $output;

// We're trusting author input, so let's at least make sure it looks like a valid orderby statement
if ( isset( $attr['orderby'] ) ) {
    $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
    if ( !$attr['orderby'] )
        unset( $attr['orderby'] );
}

extract(shortcode_atts(array(
    'order'      => 'ASC',
    'orderby'    => 'menu_order ID',
    'id'         => $post ? $post->ID : 0,
    'itemtag'    => 'dl',
    'icontag'    => 'dt',
    'captiontag' => 'dd',
    'columns'    => 3,
    'size'       => 'thumbnail',
    'include'    => '',
    'exclude'    => '',
    'link'       => ''
), $attr, 'gallery'));

$id = intval($id);
if ( 'RAND' == $order )
    $orderby = 'none';

if ( !empty($include) ) {
    $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

    $attachments = array();
    foreach ( $_attachments as $key => $val ) {
        $attachments[$val->ID] = $_attachments[$key];
    }
} elseif ( !empty($exclude) ) {
    $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
} else {
    $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
}

if ( empty($attachments) )
    return '';

if ( is_feed() ) {
    $output = "\n";
    foreach ( $attachments as $att_id => $attachment )
        $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
    return $output;
}

$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$icontag = tag_escape($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';

$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
$float = is_rtl() ? 'right' : 'left';

$selector = "gallery-{$instance}";

$gallery_style = $gallery_div = '';
if ( apply_filters( 'use_default_gallery_style', true ) )
    $gallery_style = "
    <style type='text/css'>
        #{$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>";
$size_class = sanitize_html_class( $size );
$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

$i = 0;
foreach ( $attachments as $id => $attachment ) {
    if ( ! empty( $link ) && 'file' === $link )
        $image_output = wp_get_attachment_link( $id, $size, false, false );
    elseif ( ! empty( $link ) && 'none' === $link )
        $image_output = wp_get_attachment_image( $id, $size, false );
    else
        $image_output = wp_get_attachment_link( $id, $size, true, false );

    $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'>
            " . wptexturize($attachment->post_excerpt) . "
            </{$captiontag}>";
    }
    $output .= "</{$itemtag}>";
    if ( $columns > 0 && ++$i % $columns == 0 )
        $output .= '<br style="clear: both" />';
}

$output .= "
        <br style='clear: both;' />
    </div>\n";

return $output;
}
add_filter("post_gallery", "is_gallery",10,2);

Can you show me how to insert the category feature into the galley_shortcode?

Thank you in advance.

Would that be correct then?

function is_gallery($output, $attr) {
$post = get_post();

static $instance = 0;
$instance++;

if ( ! empty( $attr['ids'] ) ) {
// 'ids' is explicitly ordered, unless you specify otherwise.
if ( empty( $attr['orderby'] ) )
    $attr['orderby'] = 'post__in';
$attr['include'] = $attr['ids'];
}

// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
return $output;

// We're trusting author input, so let's at least make sure it looks like a valid     orderby statement
if ( isset( $attr['orderby'] ) ) {
$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
if ( !$attr['orderby'] )
    unset( $attr['orderby'] );
}

extract(shortcode_atts(array(
'order'      => 'ASC',
'orderby'    => 'menu_order ID',
'id'         => $post ? $post->ID : 0,
'itemtag'    => 'dl',
'icontag'    => 'dt',
'captiontag' => 'dd',
'columns'    => 3,
'size'       => 'thumbnail',
'include'    => '',
'exclude'    => '',
'link'       => ''
), $attr, 'gallery'));

$id = intval($id);
if ( 'RAND' == $order )
$orderby = 'none';

$beta_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'beta', // note: use category SLUG
) );

$beta_id_array = array();
foreach ( $beta_attachments as $beta ) {
$beta_id_array[] = $beta->ID;
}
$beta_ids = implode( ',', $beta_id_array );

$gamma_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'gamma', // note: use category SLUG
) );

$gamma_id_array = array();
foreach ( $gamma_attachments as $gamma ) {
$gamma_id_array[] = $gamma->ID;
}
$gamma_ids = implode( ',', $gamma_id_array );

$alpha_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'alpha', // note: use category SLUG
) );

$alpha_id_array = array();
foreach ( $alpha_attachments as $alpha ) {
$alpha_id_array[] = $alpha->ID;
}
$alpha_ids = implode( ',', $alpha_id_array );

if ( !empty($include) ) {
$_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

$attachments = array();
foreach ( $_attachments as $key => $val ) {
    $attachments[$val->ID] = $_attachments[$key];
}
} elseif ( !empty($exclude) ) {
$attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
} else {
$attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
}

if ( empty($attachments) )
return '';

if ( is_feed() ) {
$output = "\n";
foreach ( $attachments as $att_id => $attachment )
    $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
return $output;
}

$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$icontag = tag_escape($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';

$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
$float = is_rtl() ? 'right' : 'left';

$selector = "gallery-{$instance}";

$gallery_style = $gallery_div = '';
if ( apply_filters( 'use_default_gallery_style', true ) )
$gallery_style = "
<style type='text/css'>
    #{$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>";
$size_class = sanitize_html_class( $size );
$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
$output = apply_filters( 'gallery_style', $gallery_style . "\n\t\t" . $gallery_div );

$i = 0;
foreach ( $attachments as $id => $attachment ) {
if ( ! empty( $link ) && 'file' === $link )
    $image_output = wp_get_attachment_link( $id, $size, false, false );
elseif ( ! empty( $link ) && 'none' === $link )
    $image_output = wp_get_attachment_image( $id, $size, false );
else
    $image_output = wp_get_attachment_link( $id, $size, true, false );

$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'>
        " . wptexturize($attachment->post_excerpt) . "
        </{$captiontag}>";
}
$output .= "</{$itemtag}>";
if ( $columns > 0 && ++$i % $columns == 0 )
    $output .= '<br style="clear: both" />';
}

$output .= "
    <br style='clear: both;' />
</div>\n";

return $output;
}
add_filter("post_gallery", "is_gallery",10,2);

Update

hi Chip,

people.php:

 <?php
 /**
 * Template Name: People Gallery
 */

 get_header(); ?>

<?php

$people_attachments = new WP_Query( array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'posts_per_page' => 0,
'category_name' => 'people', // note: use category SLUG
) );

$people_id_array = array();

if ( $people_attachments->have_posts() ) : while ( $people_attachments->have_posts() ) : $people_attachments->the_post();

$people_id_array[] = get_the_ID();

endwhile; endif;
// Important!
wp_reset_postdata();

$people_ids = implode( ',', $people_id_array );

echo do_shortcode( '[gallery link="file" columns="5" order="DESC" orderby="ID" include="' . $people_ids . '"]' );

?>

<?php var_dump( $people_id_array ); ?>

<?php // get_sidebar(); ?>

<?php get_footer(); ?>

Working now

Share Improve this question edited Apr 16, 2014 at 23:44 asked Apr 13, 2014 at 17:50 vega 6510 bronze badges

Re: Notice: Undefined property - check carefully for syntax errors, and spelling errors. $people_attachments returns a valid query object, so you shouldn't be seeing that error. – Chip Bennett Commented Apr 16, 2014 at 11:52
I copied the complete code, as you can see. Did YOU find any syntax error? I could not. – vega Commented Apr 16, 2014 at 15:06
That error is telling you that $people_attachments isn't a valid query object. You need to debug to find out why. – Chip Bennett Commented Apr 16, 2014 at 15:09
1 change while ( $alpha_attachments->have_posts ) to while ( $alpha_attachments->have_posts() ) - there is a missing set of () – Stephen S. Commented Apr 16, 2014 at 17:24
1 @vega you should consider marking this question as answered and opening up a new question regarding the image size as they are separate topics – Stephen S. Commented Apr 17, 2014 at 15:27

| Show 4 more comments

1 Answer 1

Sorted by: Reset to default 3

Edit

If this is your goal:

I want to use the Wordpress gallery to show all pictures of one category in a gallery (on a fixed page), which I do not have to update all the time by inserting the pictures manually.

Then the easiest way to accomplish it is via custom page template.

Create the template

Copy your page.php template file, and name it template-alpha-gallery.php

At the top, add the following:

 <?php
 /**
  * Template Name: Alpha Gallery
  */

Keep <?php get_header(); ?> and <?php get_footer(); ?>, and whatever HTML markup you need to keep. Delete the existing Loop code.
Note: the template HTML/loop markup is very Theme-dependent. You'll need to modify these instructions as appropriate for your current Theme.

In place of the Loop code, add the shortcode output from below:

 $alpha_attachments = new WP_Query( array(
     'post_type' => 'attachment',
     'post_status' => 'inherit',
     'posts_per_page' => 0,
     'category_name' => 'alpha', // note: use category SLUG
 ) );

 $alpha_id_array = array();

 foreach ( $alpha_attachments->posts as $alpha ) {
     $alpha_id_array[] = $alpha->ID;
 }

 $alpha_ids = implode( ',', $alpha_id_array );

 echo do_shortcode( '[gallery ids="' . $gallery_ids . '"]' );

Create a new Static Page, and assign it the "Alpha Gallery" page template
Enjoy your gallery

Original Answer

The [gallery] shortcode doesn't accept a "category" parameter, however, it does include an 'include' parameter, that accepts a comma-separated list of attachment IDs:

[gallery include="1,2,3"]

So, you can use include to list IDs for all of the attachments that have your specified category.

First, query the correct attachments:

$alpha_attachments = new WP_Query( array(
    'post_type' => 'attachment',
    'post_status' => 'inherit',
    'posts_per_page' => 0,
    'category_name' => 'alpha', // note: use category SLUG
) );

Then, loop through and grab the IDs:

Edit

You need to WordPress loop through the results. Instead of this:

$alpha_id_array = array();

foreach ( $alpha_attachments as $alpha ) {
    $alpha_id_array[] = $alpha->ID;
}

...do this:

$alpha_id_array = array();

if ( $alpha_attachments->have_posts() ) : while ( $alpha_attachments->have_posts() ) : $alpha_attachments->the_post();

    $alpha_id_array[] = get_the_ID();

endwhile; endif;
// Important!
wp_reset_postdata();

Then, format the string:

$alpha_ids = implode( ',', $alpha_id_array );

Then, pass that string to the shortcode. If you're using a custom page template, you can do it like so:

echo do_shortcode( '[gallery include="' . $alpha_ids . '"]' );

And that should be it.

Edit

When I click on the file, it loads the biggest available size. Can you tell me, where is the link creation or the expression for in which size to open. I created custom sizes vor example "gallerysize" or "blogsize", but I do not know, how to use them here in this gallery.

The [gallery] shortcode has a size parameter. Just add it to your output; for example, for "medium" images:

echo do_shortcode( '[gallery size="medium" include="' . $alpha_ids . '"]' );

科技改变生活-雨落星辰 - 所有的伟大,都源于一个勇敢的开始

Connecting Wordpress gallery to custom categories (taxonomy)

Update

Update

1 Answer 1

Edit

Create the template

Original Answer

Edit

Edit

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