composer require phpmailer/phpmailer

<?php

namespace util;

use PHPMailer\PHPMailer\PHPMailer;

class Mailer
{
   // 编码格式为utf8，不设置编码的话，中文会出现乱码
   protected $charSet = 'utf-8';

   // 发送方的SMTP服务器地址，QQ邮箱为：smtp.qq.com
   protected $host = 'smtp.163.com';

   // 163邮箱的ssl协议方式端口号是465/994  QQ邮箱的ssl协议方式端口号是465/587
   protected $port = 465;

   // 是否使用身份验证，默认false
   protected $smtpAuth = true;

   // 发送方的邮箱用户名，就是你申请163的SMTP服务使用的163邮箱，或者QQ邮箱等
   protected $mailUsername = '';

   // 发送方的邮箱密码，注意用163邮箱这里填写的是“客户端授权密码”而不是邮箱的登录密码！QQ邮箱同理，如果没有授权码就是邮箱密码
   protected $mailPassword = '';

   // 使用ssl协议方式
   protected $smtpSecure = 'ssl';

   // 错误调试，默认关闭
   protected $smtpDebug = 0;

   // 发送邮件地址
   protected $mailFrom = '';

   // 发送名称
   protected $mailFromname = '';

   // 回复邮箱地址
   protected $replyMail = '';

   /**
    * 初始化发送邮件参数
    * @param array $conf
    */
   public function __construct($conf = [])
   {
       if (!empty($conf)) {
           $this->charSet      = !empty($conf['charSet']) ? $conf['charSet'] : $this->charSet;
           $this->host         = !empty($conf['host']) ? $conf['host'] : $this->host;
           $this->port         = !empty($conf['port']) ? $conf['port'] : $this->port;
           $this->smtpAuth     = isset($conf['smtpAuth']) ? $conf['smtpAuth'] : $this->smtpAuth;
           $this->mailUsername = !empty($conf['mailUsername']) ? $conf['mailUsername'] : $this->mailUsername;
           $this->mailPassword = !empty($conf['mailPassword']) ? $conf['mailPassword'] : $this->mailPassword;
           $this->smtpSecure   = isset($conf['smtpSecure']) ? $conf['smtpSecure'] : $this->smtpSecure;
           $this->smtpDebug    = isset($conf['smtpDebug']) ? $conf['smtpDebug'] : $this->smtpDebug;
           $this->mailFrom     = !empty($conf['mailFrom']) ? $conf['mailFrom'] : $this->mailFrom;
           $this->mailFromname = !empty($conf['mailFromname']) ? $conf['mailFromname'] : $this->mailFromname;
       } else {
           $mail_smtpAuth   = config('email.mail_smtpAuth');
           $mail_smtpSecure = config('email.mail_smtpSecure');
           $mail_smtpDebug  = config('email.mail_smtpDebug');

           $this->host         = !empty(config('email.mail_host')) ? config('email.mail_host') : $this->host;
           $this->port         = !empty(config('email.mail_port')) ? config('email.mail_port') : $this->port;
           $this->smtpAuth     = isset($mail_smtpAuth) ? config('email.mail_smtpAuth') : $this->smtpAuth;
           $this->mailUsername = !empty(config('email.mail_mailUsername')) ? config('email.mail_mailUsername') : $this->mailUsername;
           $this->mailPassword = !empty(config('email.mail_mailPassword')) ? config('email.mail_mailPassword') : $this->mailPassword;
           $this->smtpSecure   = isset($mail_smtpSecure) ? config('email.mail_smtpSecure') : $this->smtpSecure;
           $this->smtpDebug    = isset($mail_smtpDebug) ? config('email.mail_smtpDebug') : $this->smtpDebug;
           $this->mailFrom     = !empty(config('email.mail_mailFrom')) ? config('email.mail_mailFrom') : $this->mailFrom;
           $this->mailFromname = !empty(config('email.mail_mailFromname')) ? config('email.mail_mailFromname') : $this->mailFromname;
       }
   }

   /**
    * 发送邮件
    *
    * @param string|array $to_mail 单人发送为邮箱地址，多人发送[['email'=>'***@163.com', 'name'=>'发送人名称']]
    * @param string $mail_title    发送邮件标题
    * @param string $mail_body     发送邮件正文
    * @param string $to_name       单人发送时，个人名称，多人无效
    * @param array $options        抄送、秘密抄送、附件设置，格式
    * cc, bcc, attachment 使用到哪个传哪个就行了，不需要的可以不写
    * [
    *   'cc'  => [['email'=>'抄送邮箱地址1', 'name'=>'收件人姓名，如果为空此参数可没有']],
    *   'bcc' => [['email'=>'秘密抄送邮箱地址1', 'name'=>'收件人姓名，如果为空此参数可没有']],
    *   'attachment' => [['file_path'=>'附件地址', 'file_name'=>'附件名称，如果为空此参数可没有']]
    * ]
    * @return array
    */
   public function sendEmail($to_mail = '', $mail_title = '', $mail_body = '', $to_name = '', $options = [])
   {
       $mailer = new PHPMailer();

       // 使用SMTP服务
       $mailer->isSMTP();
       $mailer->isHTML();
       $mailer->SMTPDebug  = $this->smtpDebug;
       $mailer->CharSet    = $this->charSet;
       $mailer->Host       = $this->host;
       $mailer->Port       = $this->port;
       $mailer->SMTPAuth   = $this->smtpAuth;
       $mailer->Username   = $this->mailUsername;
       $mailer->Password   = $this->mailPassword;
       $mailer->SMTPSecure = $this->smtpSecure;
       $mailer->From       = $this->mailFrom;
       $mailer->FromName   = $this->mailFromname;

       // 设置收件人信息，如邮件格式说明中的收件人，这里会显示为 zhangsan(yyyy@163.com)
       if (is_array($to_mail)) {
           foreach ($to_mail as $mail) {
               $mailer->addAddress($mail['email'], $mail['name']);
           }
       } else {
           $mailer->addAddress($to_mail, $to_name);
       }

       if (!empty($this->replyMail)) {
           // 设置回复人信息，指的是收件人收到邮件后，如果要回复，回复邮件将发送到的邮箱地址，第二个参数代表回复的邮箱收到邮件后看到名称
           $mailer->addReplyTo($this->replyMail, $to_name);
           if (is_array($to_mail)) {
               foreach ($to_mail as $mail) {
                   $mailer->addReplyTo($mail['email'], $mail['name']);
               }
           } else {
               $mailer->addReplyTo($to_mail, $to_name);
           }
       }

       // 设置邮件抄送人，邮件地址和姓名
       if (isset($options['cc'])) {
           $cc_mail = $options['cc'];
           foreach ($cc_mail as $mail) {
               $mail_name = $mail['name'] ?? $mail['name'];
               $mailer->addCC($mail['email'], $mail_name);
           }
       }

       // 设置秘密抄送人，邮件地址和姓名
       if (isset($options['bcc'])) {
           $bcc_mail = $options['bcc'];
           foreach ($bcc_mail as $mail) {
               $mail_name = $mail['name'] ?? $mail['name'];
               $mailer->addBCC($mail['email'], $mail_name);
           }
       }

       // 设置发送附件，** 文件地址不支持URL格式 **
       if (!empty($options['attachment'])) {
           $attachment = $options['attachment'];
           foreach ($attachment as $val) {
               $file_name = isset($val['file_name']) ? $val['file_name'] : '';
               $mailer->addAttachment($val['file_path'], $file_name);
           }
       }

       $mailer->Subject = $mail_title; // 邮件标题
       $mailer->Body    = $mail_body;  // 邮件正文
       $mailer->AltBody = "请切换到支持 HTML 的邮件客户端，或者使用浏览器打开";  // 这个是设置纯文本方式显示的正文内容，如果不支持Html方式，就会用到这个，基本无用

       // 发送邮件
       if (!$mailer->send()) {
           // 输出错误信息
           return ['code'=>1, 'msg'=>$mailer->ErrorInfo];
       }

       return ['code'=>0];
   }
}

# 需要引入文件
use util\Mailer;

# 使用
$Mailer = new Mailer();

# 发送
$email   = '****@qq.com';
$options = [
   'cc' => [
       ['email'=>'****@163.com', 'name'=>'163邮箱1']
   ],
   'bcc' => [
       ['email'=>'****@qq.com', 'name'=>'QQ邮箱2']
   ],
];
$res     = $Mailer->sendEmail($email, '测试标题', '测试内容', 'QQ邮箱1', $options);
print_r($res);