php实现统计邮件大小的方法

<?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           
?>