对使用对帖子执行SQL查询LIKE \'x%\', 哪里x 这是你的信。

下面是一个简单的示例：

global $wpdb, $post;

$letter = \'a\'; // or $_GET[\'letter\']...

$query = "SELECT * FROM {$wpdb->posts} WHERE post_name LIKE %s";
$query = $wpdb->prepare($query, $letter.\'%\');

$results = $wpdb->get_results($query);

// note that variable name must be $post, 
// because you need to override stupid wp globals...    
foreach($results as $post){

  setup_postdata($post);

  // the usual loop functions go here
  the_title();

}

wp_reset_postdata();