* @since 2.5
* @param int|string|object $id_or_email A user ID, email address, or comment object
function get_avatar( $id_or_email, $size = '96', $default = '', $alt = false ) {
endif;  
*
* @param string $default URL to a default image to use if no avatar is available

WordPress默认的头像是读取gravatar.com上的图片的，对于国内用户来说会使网页打开速度变慢。所以我决定删除掉这块功能。

修改get_avatar函数，在wp-includes/pluggable.php内。修改后的函数如下：

$safe_alt = esc_attr( $alt );
* @return string tag for the user's avatar

即使用该函数，仅可能返回一个默认头像（位于wp-includes/images/blank.gif内），再配合simple local avatars或Add Local Avatar插件，就实现了预期的效果。

/**
$safe_alt = '';
return apply_filters('get_avatar', $avatar, $id_or_email, $size, $default, $alt);
if ( !is_numeric($size) )
*/
else
$default = includes_url('images/blank.gif');

$size = '96';
* @param string $alt Alternate text to use in image tag. Defaults to blank
* @param int $size Size of the avatar image
* Retrieve the avatar for a user who provided a user ID or email address.
}
$avatar = "";
if ( ! get_option('show_avatars') )
if ( false === $alt)
if ( !function_exists( 'get_avatar' ) ) :
return false;