WordPress 判断邮箱是否设置了头像

wordpress 判断邮箱是否设置了头像，做一下记录，下面有代码出处。

function validate_gravatar($email) {     // Craft a potential url and test its headers     $hash = md5(strtolower(trim($email)));     $uri = 'http://www.gravatar.com/avatar/' . $hash . '?d=404';     $headers = @get_headers($uri);     if (!preg_match("|200|", $headers[0])) {         $has_valid_avatar = FALSE;     } else {         $has_valid_avatar = TRUE;     }     return $has_valid_avatar; }

代码出处：https://stackoverflow.com/questions/32755354/check-if-a-user-has-a-gravatar-wordpress