wp-includes/class-oembed.php 具有公共变量$providers. 因此，您可以构建一个小函数来获取所有这些函数：

function list_oembed_providers( $print = TRUE )
{
    require_once( ABSPATH . WPINC . \'/class-oembed.php\' );
    $oembed = _wp_oembed_get_object();

    $print and print \'<pre>\' . htmlspecialchars( var_export( $oembed->providers, TRUE ) ) . \'</pre>\';
    return $oembed->providers;
}

list_oembed_providers();

array (
  \'#http://(www\\\\.)?youtube.com/watch.*#i\' => 
  array (
    0 => \'http://www.youtube.com/oembed\',
    1 => true,
  ),
  \'http://youtu.be/*\' => 
  array (
    0 => \'http://www.youtube.com/oembed\',
    1 => false,
  ),
  \'http://blip.tv/file/*\' => 
  array (
    0 => \'http://blip.tv/oembed/\',
    1 => false,
  ),
  \'#http://(www\\\\.)?vimeo\\\\.com/.*#i\' => 
  array (
    0 => \'http://www.vimeo.com/api/oembed.{format}\',
    1 => true,
  ),
  \'#http://(www\\\\.)?dailymotion\\\\.com/.*#i\' => 
  array (
    0 => \'http://www.dailymotion.com/api/oembed\',
    1 => true,
  ),
  \'#http://(www\\\\.)?flickr\\\\.com/.*#i\' => 
  array (
    0 => \'http://www.flickr.com/services/oembed/\',
    1 => true,
  ),
  \'#http://(.+)?smugmug\\\\.com/.*#i\' => 
  array (
    0 => \'http://api.smugmug.com/services/oembed/\',
    1 => true,
  ),
  \'#http://(www\\\\.)?hulu\\\\.com/watch/.*#i\' => 
  array (
    0 => \'http://www.hulu.com/api/oembed.{format}\',
    1 => true,
  ),
  \'#http://(www\\\\.)?viddler\\\\.com/.*#i\' => 
  array (
    0 => \'http://lab.viddler.com/services/oembed/\',
    1 => true,
  ),
  \'http://qik.com/*\' => 
  array (
    0 => \'http://qik.com/api/oembed.{format}\',
    1 => false,
  ),
  \'http://revision3.com/*\' => 
  array (
    0 => \'http://revision3.com/api/oembed/\',
    1 => false,
  ),
  \'http://i*.photobucket.com/albums/*\' => 
  array (
    0 => \'http://photobucket.com/oembed\',
    1 => false,
  ),
  \'http://gi*.photobucket.com/groups/*\' => 
  array (
    0 => \'http://photobucket.com/oembed\',
    1 => false,
  ),
  \'#http://(www\\\\.)?scribd\\\\.com/.*#i\' => 
  array (
    0 => \'http://www.scribd.com/services/oembed\',
    1 => true,
  ),
  \'http://wordpress.tv/*\' => 
  array (
    0 => \'http://wordpress.tv/oembed/\',
    1 => false,
  ),
  \'#http://(answers|surveys)\\\\.polldaddy.com/.*#i\' => 
  array (
    0 => \'http://polldaddy.com/oembed/\',
    1 => true,
  ),
  \'#http://(www\\\\.)?funnyordie\\\\.com/videos/.*#i\' => 
  array (
    0 => \'http://www.funnyordie.com/oembed\',
    1 => true,
  ),
)