图片信息实际仍存储在posts表中，post_type为attachment
后台相册编辑界面里没有专门的栏目用于填写外链地址，不过可以通过其他字段实现啊
如下图，在alt text字段里填上该图片的外链
接着，需要参考wp-includes/media.php文件里的gallery_shortcode函数来重构gallery的输出
在functions.php中添加代码如下：
add_filter('post_gallery', 'my_post_gallery', 10, 3)function my_post_gallery( $html = '', $attr, $instance ) {
$post = get_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' => 'none'
), $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'] ) {
$attr['alt'] = get_the_title($post->ID)
$image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr )
$custom_link = trim( strip_tags( get_post_meta( $id, '_wp_attachment_image_alt', true ) ) )
$image_output = sprintf( '<a href="%s" title="%s">%s<a>',
$custom_link,
$attr['alt'],
$image_output
)
} 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}>"
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
}
最后的效果:
这个其实可以直接使用WordPress默认的媒体库功能，然后创建相册即可，只是这个需要你所使用的WordPress主题前端CSS的一个美化，你看看截图，是不是这样的效果呢！
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