一、为分类目录添加维护图像地址的文本框

请将以下代码添加到WordPress企业主题的functions.php文件中：

<?php
global $texonomy_slug;
$texonomy_slug='category'; // texonomy slug
add_action($texonomy_slug.'_add_form_fields','categoryimage');
function categoryimage($taxonomy){ ?>
    <div>
    <label for="tag-image">分类图像</label>
    <input type="text" name="tag-image" id="tag-image" value="" /><br /><span>请在此输入图像URL地址。</span>
</div>
<?php script_css(); }
add_action($texonomy_slug.'_edit_form_fields','categoryimageedit');
function categoryimageedit($taxonomy){ ?>
<tr>
    <th scope="row" valign="top"><label for="tag-image">图像</label></th>
    <td><input type="text" name="tag-image" id="tag-image" value="<?php echo get_option('_category_image'.$taxonomy->term_id); ?>" /><br /><span>请在此输入图像URL地址。</span></td>
</tr>
<?php script_css(); }
function script_css(){ ?>
<script type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/category-image_thickbox.js"></script>
<link rel='stylesheet' id='thickbox-css'  href='<?php echo includes_url(); ?>js/thickbox/thickbox.css' type='text/css' media='all' />
<script type="text/javascript">
    jQuery(document).ready(function() {
    var fileInput = '';
    jQuery('#tag-image').live('click',
    function() {
        fileInput = jQuery('#tag-image');
        tb_show('', 'media-upload.php?type=image&amp;TB_iframe=true');
        return false;
    });
        window.original_send_to_editor = window.send_to_editor;
    window.send_to_editor = function(html) {
        if (fileInput) {
            fileurl = jQuery('img', html).attr('src');
            if (!fileurl) {
                fileurl = jQuery(html).attr('src');
            }
            jQuery(fileInput).val(fileurl);

            tb_remove();
        } else {
            window.original_send_to_editor(html);
        }
    };
    });

</script>
<?php }
//edit_$taxonomy
add_action('edit_term','categoryimagesave');
add_action('create_term','categoryimagesave');
function categoryimagesave($term_id){
    if(isset($_POST['tag-image'])){
        if(isset($_POST['tag-image']))
            update_option('_category_image'.$term_id,$_POST['tag-image'] );
    }
}
function print_image_function(){
    $texonomy_slug='category';
    $_terms = wp_get_post_terms(get_the_ID(),$texonomy_slug);
    $_termsidlist=array();
    $result = '';
    foreach($_terms as $val){
        $result .= '<div style="float:left; margin-right:2px;"><a href="'.get_term_link($val).'"><img height="22px" title="'.$val->name.'" alt="'.$val->name.'" src="'.get_option('_category_image'.$val->term_id).'" /></a></div>';
    }
    return $result;
}
add_shortcode('print-image','print_image_function');
?>

效果图如下：

二、在WordPress企业主题中显示分类图像

在需要显示分类目录的指定位置添加一下代码，我因为需要在页面循环显示所有的分类，因此使用以下foreach循环，大家可以根据需要进行修改：

<?php
$categories=get_categories($args);
foreach($categories as $category) {
    if ( get_option('_category_image'.$category->term_id) ){
            echo '<div><a href="'.get_term_link($category).'"><img title="'.$category->name.'" alt="'.$category->name.'" src="'.get_option('_category_image'.$category->term_id).'" /></a></div>';
    }
    echo '<div style=" text-align:center;"><a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '><b>' . $category->name.'</b></a></div>';
}?>

页面中同时显示分类和图像的效果如下，该效果大大丰富了网站的色彩，推荐大家使用。