wordpress 注册短码（简码）

        偶然间看到，之后可能会用到，所以在这里记录一下。

add_shortcode('hack_my_db', 'hack_my_db');
function hack_my_db() {
    $id = $_GET['id'];
    global $wpdb;
    $post_title = $wpdb->get_var('SELECT post_title from wp_posts WHERE ID='.$id);
    return $post_title;
}

下面展示一下我代码库里的两个短代码例子：

1、文章内容密码可见

<?php
function e_secret($atts, $content=null){
    extract(shortcode_atts(array('key'=>null), $atts));
    if(isset($_POST['e_secret_key']) && $_POST['e_secret_key']==$key){
        return '
<div class="e-secret">'.$content.'</div>
';
    }
    else{
        return '
<form class="e-secret" action="'.get_permalink().'" method="post" name="e-secret"><label>输入密码查看内容：</label><input type="password" name="e_secret_key" class="euc-y-i" maxlength="50"><input type="submit" class="euc-y-s" value="确定">
<div class="euc-clear"></div>
</form>
';
    }
}
add_shortcode('secret','e_secret');
//[secret key="密码"]加密内容[/secret]
?>

2、文章内容评论可见

<?php
function reply_to_read($atts, $content=null) {     
        extract(shortcode_atts(array("notice" => '<p class="reply-to-read">温馨提示: 此处内容需要<a href="#respond" title="评论本文">评论本文</a>后才能查看.</p>'), $atts));     
        $email = null;     
        $user_ID = (int) wp_get_current_user()->ID;     
        if ($user_ID > 0) {     
            $email = get_userdata($user_ID)->user_email;     
            //对博主直接显示内容     
            $admin_email = "[email protected]"; //自己的Email地址
            if ($email == $admin_email) {     
                return $content;     
            }     
        } else if (isset($_COOKIE['comment_author_email_' . COOKIEHASH])) {     
            $email = str_replace('%40', '@', $_COOKIE['comment_author_email_' . COOKIEHASH]);     
        } else {     
            return $notice;     
        }     
        if (empty($email)) {     
            return $notice;     
        }     
        global $wpdb;     
        $post_id = get_the_ID();     
        $query = "SELECT `comment_ID` FROM {$wpdb->comments} WHERE `comment_post_ID`={$post_id} and `comment_approved`='1' and `comment_author_email`='{$email}' LIMIT 1";     
        if ($wpdb->get_results($query)) {     
            return do_shortcode($content);     
        } else {     
            return $notice;     
        }     
    }     
    add_shortcode('reply', 'reply_to_read
//
  此处内容已隐藏，请评论后刷新页面查看.
//
自定义的提示信息
?>