WP plugin: Post Image

插件使用说明

安装插件把文件post-image.php上传到 WP安装目录/wp-content/plugins下并且在插件工具管理下激活.
修改模板在模板文章循环的部位，例如<?php the_content('Read the rest of this entry »'); ?>加上
<?php post_image('default_image', use_thumb, img_tag, 'css_class', 'customkey', display); ?>
~or~
<?php szub_post_image('args'); ?>

参数

default_image

(string) 当文章没有图片显示的时候的图片默认链接.
use_thumb

(boolean) 显示图片缩略图.设置TRUE (1)为使用缩略图,FALSE (0)为否.默认为 FALSE (0).

img_tag

(boolean) 在标签<img>中显示图片. 插件将自动分配给图片标题,alt、宽度、高度.设置FALSE (0) 将显示图片原始链接,默认设置为Default is TRUE (1) .

css_class

(string) 提供给标签 <img>的CSS类名.用这个美化你的图片格式,默认设置名为'post-image'.

customkey

(string) 图片“attachment”自定义字段名.用这个字段名的值可以越过帖子里面的其他图片附件或者默认图片. 默认设置为‘post-image’.

display

(boolean)是否显示图片或者用在其他代码中返回.设置为FALSE (0) 为返回.默认为TRUE (1).

实例

<?php post_image(); ?>

没有图片的文章没有默认图片；显示图片没有缩略图；显示在标签<img>中；用css 类‘post-images’。

<?php post_image('/blog/wp-content/images/post.jpg', true); ?>

设置 ‘/blog/wp-content/images/post.jpg’ 为默认图片；显示附件缩略图;显示在标签<img>中;用css 类‘post-images’.

<a href="<?php the_permalink(); ?>"><img src="<?php post_image('/images/posticon.png', false, false); ?>" width="32" height="32" /></a>

显示图片链接为帖子的永久链接；设置‘/images/posticon.png’为默认图片；不显示缩略图；显示原始链接无标签。

<?php $thumb = szub_post_image('use_thumb=1&display=0'); ?>
<?php if($thumb) : ?>
<p><a href="<?php the_permalink(); ?>"><?php echo $thumb; ?></a></p>
<?php endif; ?>

用szub_post_image()去分配图片附件缩略图（显示为0关闭），如果不存在链接文章链接。

post-image.php 源文件

PHP代码

<?php
/*
Plugin Name: Post Image
Plugin URI: http://guff.szub.net/post-image
Description: Display an image 'attached' to each post. Use post_image() or szub_post_image() in The Loop.
Version: R1.1.1
Author: Kaf Oseo
Author URI: http://szub.net/
Post Image is released under the GNU General Public License (GPL)
http://www.gnu.org/licenses/gpl.txt
This is a WordPress 2 plugin (http://wordpress.org).
~Changelog:
R1.1.1 (Jan-04-2007)
Missed this bug fix: Avoid displaying "broken" img tag when no image
exists.
R1.1 (Jan-04-2007)
You can specify an image attachment to use by inserting 'post-image'
(or whatever is set for the 'customkey' parameter) somewhere in the
(upload) title field. Hit a few buggy bits such as with 'thumbnail'
filenames for language localization, and implemented pseudo-caching
on multi-post queries.
R1 (Mar-17-2006)
Along with bug swattings from 0.1 (beta), the following changes and
features provided with this full release: new query_string argument
wrapper function (szub_post_image()); override an attachment and/or
$default_image for individual posts through a custom field (default
key: post-image); if $img_tag is set to true/1 and display false/0,
now returns complete <img> element (previously it returned only the
image's url). Tentative support for WordPress 2.1.
*/
function szub_post_image($args='') {
parse_str($args);
if( !isset($default_image) ) $default_image = '';
if( !isset($use_thumb) ) $use_thumb = false;
if( !isset($img_tag) ) $img_tag = true;
if( !isset($css_class) ) $css_class = 'post-image';
if( !isset($customkey) ) $customkey = 'post-image';
if( !isset($display) ) $display = true;
return post_image($default_image, $use_thumb, $img_tag, $css_class, $customkey, $display);
}
function post_image($default_image='', $use_thumb=false, $img_tag=true, $css_class='post-image', $customkey='post-image', $display=true) {
global $post, $posts, $wp_version, $wpdb;
global $post_image_attachments;
if( empty($post) )
return;
if( !empty($posts) ) {
foreach($posts as $apost) {
if( $posts[0] != $apost )
$IN_ids .= ',';
$IN_ids .= (int) $apost->ID;
}
}
if( !empty($default_image) ) {
$img_url = $default_image;
$img_title = apply_filters('the_title', $post->post_title);
}
$post_custom = get_post_custom($post->ID);
$meta_value = $post_custom["$customkey"][0];
if( $meta_value ) {
$img_url = $meta_value;
$img_title = apply_filters('the_title', $post->post_title);
} else {
if( empty($post_image_attachments) ) {
$record = ( $wp_version < 2.1 ) ? 'post_status' : 'post_type';
$post_image_attachments = @$wpdb->get_results("SELECT ID, post_parent, post_title, post_content, guid FROM $wpdb->posts WHERE post_parent IN($IN_ids) AND $record = 'attachment' AND post_mime_type LIKE '%image%' ORDER BY post_date ASC");
}
foreach( $post_image_attachments as $attachment ) {
if( $post->ID == $attachment->post_parent ) {
if( !$first_attachment ) {
$img_url = $attachment->guid;
$img_title = apply_filters('the_title', $attachment->post_title);
$first_attachment = 1;
}
$postmarked = strpos(strtolower($attachment->post_title), strtolower($customkey));
$fileimage = explode('.', basename($attachment->guid));
if( $postmarked == true || $post->ID == $fileimage[0] || $post->post_name == $fileimage[0] ) {
$img_url = $attachment->guid;
$img_title = apply_filters('the_title', $attachment->post_title);
if($postmarked == true) {
$img_title = trim(str_replace($customkey, '', $img_title));
break;
}
}
}
}
if( $use_thumb && ($img_url != $default_image) )
$img_url = preg_replace('!(\.[^.]+)?$!', __('.thumbnail') . '$1', $img_url, 1);
}
$img_path = ABSPATH . str_replace(get_settings('siteurl'), '', $img_url);
if( !file_exists($img_path) ) {
return;
} else {
if( $img_tag ) {
$imagesize = @getimagesize($img_url);
$image = '<img class="' . $css_class . '" src="' . $img_url . '" ' . $imagesize[3] . ' title="' . $img_title . '" alt="' . $img_title . '" />';
} else {
$image = $img_url;
}
}
if( $display )
echo $image;
return $image;
}
?>

责任编辑:semirock

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