我试图用默认的WP头像覆盖插件的内置头像。插件的过滤器如下：

add_filter( "idea_push_change_user_image", "idea_push_change_user_image_callback", 10, 1 );

function idea_push_change_user_image_callback( $userId ) 
{
  return "https://cdn.britannica.com/55/174255-004-9A4971E9.jpg";
}

我试着用“get\\u avatar”来代替它，但最终却得到了一张破损的jpg图像

add_filter( "idea_push_change_user_image", "idea_push_change_user_image_callback", 10, 1 );

function idea_push_change_user_image_callback( $userId ) 
{
  return get_avatar( get_the_author_meta( \'ID\' ), 32 );
}

有什么办法吗，谢谢

更新时间：

感谢您的回答，这很有帮助。原来我需要拉另一个插件（最终成员）头像，而不是默认的：

add_filter( "idea_push_change_user_image", "idea_push_change_user_image_callback", 10, 1 );

function idea_push_change_user_image_callback( $userId )
{
  return um_get_user_avatar_url();
}

奇怪的是，它只对登录的用户有效/可见，对其他任何人都不可见。

return get_avatar( get_the_author_meta( \'ID\' ), 32 ); 

return get_avatar_url( get_the_author_meta( \'ID\' ) ); 

add_filter( "idea_push_change_user_image", 
  "idea_push_change_user_image_callback", 10, 1 ); 
function 
  idea_push_change_user_image_callback( $userId ) 
{ return um_get_user_avatar_url($userId ); }