如何列出wordpress插件开发中的表格？

I want to show all table names in my plugin development. I know how to do that in core PHP.

I am trying like this:

$mytables=$wpdb->get_results("SHOW TABLES");
 foreach ($mytables as $mytable)
            {
              echo $mytable;
            }

As I said in my comment, you should use nested foreach loops.

global $wpdb;
$mytables=$wpdb->get_results("SHOW TABLES");
foreach ($mytables as $mytable)
{
    foreach ($mytable as $t) 
    {       
        echo $t . "<br>";
    }
}

Then you don't need to know the name of your database, because SHOW TABLES will create the column name "Tables_in_" (without < and > of course).

check the following function to get list of tables

    $mytables=$wpdb->get_results("SHOW TABLES FROM ".$wpdb->dbname);

    foreach ($mytables as $mytable)
    {
        echo($mytable->Tables_in_wordpress).'<br/>';
    }
    die;

There is a native function in WordPress for that: wpdb::tables( string $scope = 'all', bool $prefix = true, int $blog_id ). See https://developer.wordpress.org/reference/classes/wpdb/tables/ for details ;-)