PHP发送邮件

<?php 
    //require('./data/cache/settings.php');
    //$mail_setting  = $_CACHE['settings'];
    $mail_setting  = array (
      'accessemail' => '',
      'censoremail' => '',
      'censorusername' => '',
      'dateformat' => 'y-n-j',
      'doublee' => '0',
      'timeoffset' => '28800',
      'maildefault' => 'xxx@yeah.net',
      'mailsend' => '2',
      'mailserver' => 'smtp.yeah.net',
      'mailport' => '25',
      'mailauth' => '1',
      'mailfrom' => '捎点宝 <xxx@yeah.net>',
      'mailauth_username' => 'xxx@yeah.net',
      'mailauth_password' => '123123',//邮箱授权码
      'maildelimiter' => '0',
      'mailusername' => '1',
      'mailsilent' => '1',
      'pmfloodctrl' => '15',
      'pmcenter' => '1',
      'sendpmseccode' => '1',
      'pmsendregdays' => '0',
      'privatepmthreadlimit' => '0',
      'chatpmthreadlimit' => '1000',
      'chatpmmemberlimit' => '35',
      'timeformat' => 'h:i A',
    );

    date_default_timezone_set('PRC');
    if(empty($_GET['mod']) || empty($_GET['IP'])) exit;
    $mail = array(
        'email_to'=>'xxxx@qq.com',//收件人列表,多个用逗号隔开
        'charset'=>'utf-8',
    );    
    
    if($_GET['mod'] == 1){
        $mail['message'] = '故障描述:此服务器apache服务于' . date('Y-m-d H:i:s') . '发生apache服务崩溃并尝试重新启动';
        $mail['subject'] = $_GET['IP'] . 'apache服务出现异常';
    }elseif($_GET['mod'] == 2){
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现硬盘空间低于警戒线值';
        $mail['subject'] = $_GET['IP'] . '硬盘空间不足';
    }elseif($_GET['mod'] == 3){
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现服务器负载高于警戒线值';
        $mail['subject'] = $_GET['IP'] . '负载异常';
    }elseif($_GET['mod'] == 4){
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现服务器内存低于警戒线值';
        $mail['subject'] = $_GET['IP'] . '内存不足';
    }elseif($_GET['mod'] == 5){
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现服务器IO高于警戒线值';
        $mail['subject'] = $_GET['IP'] . 'IO异常';
    }elseif($_GET['mod'] == 6) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '检测出有人在进行getshell的高危操作，具体请查询scanning.log';
        $mail['subject'] = $_GET['IP'] . '可能有人进行getshell的攻击的操作！';
    }elseif($_GET['mod'] == 7) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '检测出有人可能已经上传成功webshell并进行非法操作，具体请查询scanning.log';
        $mail['subject'] = $_GET['IP'] . '可能已经被人上传webshell了';
    }elseif($_GET['mod'] == 8) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '检测出有人疑似在进行拖库的高危操作，具体请查询scanning.log';
        $mail['subject'] = $_GET['IP'] . '有人在进行拖库行为';
    }elseif($_GET['mod'] == 9) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '检测出鱼邻同步论坛功能可能出现故障。';
        $mail['subject'] = $_GET['IP'] . '鱼邻同步论坛功能可能出现故障';
    }elseif($_GET['mod'] == 10) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现连续' . $_GET['time'] . '分钟无法访问';
        $mail['subject'] = $_GET['IP'] . '无法访问';  
    }elseif($_GET['mod'] == 11) {
        $mail['message'] = '故障描述:此服务器于' . date('Y-m-d H:i:s') . '出现连续' . $_GET['time'] . '分钟访问速度超出了警戒线';
        $mail['subject'] = $_GET['IP'] . '访问速度超出警戒线';  
    }else{
        exit;
    }
    
    $appname = '';
    $mail['subject'] = '=?'.$mail['charset'].'?B?'.base64_encode(str_replace("\r", '', str_replace("\n", '', $mail['subject']))).'?=';
    $mail['message'] = chunk_split(base64_encode(str_replace("\r\n.", " \r\n..", str_replace("\n", "\r\n", str_replace("\r", "\n", str_replace("\r\n", "\n", str_replace("\n\r", "\r", $mail['message'])))))));
    $email_from = $mail['frommail'] == '' ? '=?'.$mail['charset'].'?B?'.base64_encode($appname)."?= <$mail_setting[maildefault]>" : (preg_match('/^(.+?) \<(.+?)\>$/',$email_from, $from) ? '=?'.$mail['charset'].'?B?'.base64_encode($from[1])."?= <$from[2]>" : $mail['frommail']);
    $maildelimiter = $mail_setting['maildelimiter'] == 1 ? "\r\n" : ($mail_setting['maildelimiter'] == 2 ? "\r" : "\n");
    $headers = "From: $email_from{$maildelimiter}X-Priority: 3{$maildelimiter}X-Mailer: Discuz! $version{$maildelimiter}MIME-Version: 1.0{$maildelimiter}Content-type: text/".($mail['htmlon'] ? 'html' : 'plain')."; charset=$mail[charset]{$maildelimiter}Content-Transfer-Encoding: base64{$maildelimiter}";
    if(!$fp = fsockopen($mail_setting['mailserver'], $mail_setting['mailport'], $errno, $errstr, 30)) {
        return false;
    }

     stream_set_blocking($fp, true);

    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != '220') {
        echo $lastmessage;
        return false;
    }

    fputs($fp, ($mail_setting['mailauth'] ? 'EHLO' : 'HELO')." discuz\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 220 && substr($lastmessage, 0, 3) != 250) {
        echo $lastmessage;
        return false;
    }

    while(1) {
        if(substr($lastmessage, 3, 1) != '-' || empty($lastmessage)) {
             break;
         }
         $lastmessage = fgets($fp, 512);
    }

    if($mail_setting['mailauth']) {
        fputs($fp, "AUTH LOGIN\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 334) {
            echo $lastmessage;
            return false;
        }

        fputs($fp, base64_encode($mail_setting['mailauth_username'])."\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 334) {
            echo $lastmessage;
            return false;
        }

        fputs($fp, base64_encode($mail_setting['mailauth_password'])."\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 235) {
            echo $lastmessage;
            return false;
        }

        $email_from = $mail_setting['mailfrom'];
    }

    fputs($fp, "MAIL FROM: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $email_from).">\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 250) {
        fputs($fp, "MAIL FROM: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $email_from).">\r\n");
        $lastmessage = fgets($fp, 512);
        if(substr($lastmessage, 0, 3) != 250) {
            echo $lastmessage;
            return false;
        }
    }

    $email_tos = array();
    foreach(explode(',', $mail['email_to']) as $touser) {
        $touser = trim($touser);
        if($touser) {
            fputs($fp, "RCPT TO: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $touser).">\r\n");
            $lastmessage = fgets($fp, 512);
            if(substr($lastmessage, 0, 3) != 250) {
                fputs($fp, "RCPT TO: <".preg_replace("/.*\<(.+?)\>.*/", "\\1", $touser).">\r\n");
                $lastmessage = fgets($fp, 512);
                echo $lastmessage;
                return false;
            }
        }
    }

    fputs($fp, "DATA\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 354) {
        echo $lastmessage;
        return false;
    }

    $headers .= 'Message-ID: <'.gmdate('YmdHs').'.'.substr(md5($mail['message'].microtime()), 0, 6).rand(100000, 999999).'@'.$_SERVER['HTTP_HOST'].">{$maildelimiter}";

    fputs($fp, "Date: ".gmdate('r')."\r\n");
    fputs($fp, "To: ".$mail['email_to']."\r\n");
    fputs($fp, "Subject: ".$mail['subject']."\r\n");
    fputs($fp, $headers."\r\n");
    fputs($fp, "\r\n\r\n");
    fputs($fp, "$mail[message]\r\n.\r\n");
    $lastmessage = fgets($fp, 512);
    if(substr($lastmessage, 0, 3) != 250) {
        echo $lastmessage;
        return false;
    }
    echo 'OK';
    fputs($fp, "QUIT\r\n");