WordPress代码 之 获取WordPress所有分类名字和ID

某些时候，我们需要获取WordPress 所有分类的名字和ID，比如，倡萌的主题设置界面，就使用了这个功能，如下图

实现的方法很简单，一起来操作吧 在主题的 functions.php 最后一个 ?> 前添加下面的代码

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function show_category(){
    global $wpdb;
    $request = "SELECt $wpdb->terms.term_id, name FROM $wpdb->terms ";
    $request .= " LEFT JOIN $wpdb->term_taxonomy ON $wpdb->term_taxonomy.term_id = $wpdb->terms.term_id ";
    $request .= " WHERe $wpdb->term_taxonomy.taxonomy = 'category' ";
    $request .= " ORDER BY term_id asc";
    $categorys = $wpdb->get_results($request);
    foreach ($categorys as $category) { //调用菜单
        $output = '<span>'.$category->name."(<em>".$category->term_id.'</em>"</span>';
        echo $output;
    }
}

function show_category("{
global $wpdb;
$request = "SELECt $wpdb->terms.term_id, name FROM $wpdb->terms ";
$request .= " LEFT JOIN $wpdb->term_taxonomy ON $wpdb->term_taxonomy.term_id = $wpdb->terms.term_id ";
$request .= " WHERe $wpdb->term_taxonomy.taxonomy = 'category' ";
$request .= " ORDER BY term_id asc";
$categorys = $wpdb->get_results($request";
foreach ($categorys as $category" { //调用菜单
$output = '<span>'.$category->name."(<em>".$category->term_id.'</em>"</span>';
echo $output;
}
}

在需要显示的地方添加下面的调用代码即可

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<?php show_category(); ?>

<?php show_category("; ?>

是不是很简单？要实现不同的样式，就自己写css吧！