我编写了在添加帖子时检查自定义帖子标题是否存在的功能。如下所示：

  function wp_exist_post_by_title( $title ) {
    global $wpdb;
    $return = $wpdb->get_row( "SELECT ID FROM wp_dxwe_posts WHERE post_title = \'" . $title . "\' && post_status = \'publish\' && post_type = \'courses\' ", \'ARRAY_N\' );
    if( empty( $return ) ) {
        return false;
    } else {
        return true;
    }
}

添加新帖子时，我的代码如下：

$check = $this->wp_exist_post_by_title( $_POST[\'course_title\']  ) ;
if($check==true)
{
  $title = \'\';
  echo "<div class=\'conditional-messages\'>Course Already Exists !</div>";
}
else 
{
  $title=$_POST[\'course_title\'];
}   
$post = array(
             \'post_title\'   => $title,
             \'post_content\'  => $description,
             \'post_status\'  => \'publish\', 
             \'post_type\'    => "courses"  
            );  
$description = $_POST[\'description\'];
$id = wp_insert_post($post);
update_post_meta($id, \'course_icon\', $attachement_id);
update_post_meta( $id, \'inistitute_name\', $institute_name);

当我添加新帖子（课程标题）时，它正在检查帖子标题是否存在或不完美，但我这里的问题是，我想检查帖子标题（课程标题）只属于一个“institute\\u name”，因为其他学院也可以有相同的课程标题（自定义帖子）。我知道我需要连接两个表，即“wp\\u posts”&；\'wp\\u Posteta’，但我无法做到。谁能告诉我怎么解决这个问题吗？谢谢你的帮助。

if (get_page_by_title(\'Some Title\', OBJECT, \'post_type\')) {
    // Exists
}

$found_post = post_exists( "My Post Title",\'\',\'\',\'\');
echo $found_post ? "Found post at id #$found_post" : "Can\'t find post!";

$found_post = post_exists( "My Post Title",\'\',\'\',\'news\');
echo $found_post ? "Found post at id #$found_post" : "Can\'t find post!";