<?php        $attach_size= 0;        if($attachmentid){  //获取附近的大小            $attach_data= attachdata($attachmentid);            if($attach_data){                foreach($attach_dataas$value) {                    $attach_size+= $value['filesize'];                }            }        }        //获取标题和邮件内容的大小        $email_content_size= 0;        $_filename= "attachment/emailsizecalculate.tmp";        $_file= fopen($_filename, "wb");        fwrite($_file, $subject.$content);        fclose($_file);        if($_temp= filesize($_filename)){            $email_content_size= $_temp;        }        $del_ret= @unlink($_filename);        $sum_size= $attach_size*1024 + $email_content_size;  //邮件总大小           ?>