一、安装PHPMailer

        进入项目目录下，执行：composer require phpmailer/phpmailer

二、使用

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true); 
header("Content-Security-Policy: script-src 'self' 'unsafe-inline' *.baidustatic.com; style-src 'self' 'unsafe-inline';");
header('Content-Type: application/json');

// 邮件配置
$mailConfig = [
    'smtp_host' => 'smtp.163.com',
    'smtp_port' => 465, // 或587
    'smtp_user' => 'xxx@163.com',
    'smtp_pass' => 'xxx',
    'from'      => 'xxx@163.com',
    'to'        => 'xxx@163.com'
];


// 发送邮件
    
try {
        $mail->SMTPDebug = 2;
        $mail->isSMTP();
        $mail->Host = $mailConfig['smtp_host'];
        $mail->SMTPAuth = true;
        $mail->Username = $mailConfig['smtp_user'];
        $mail->Password = $mailConfig['smtp_pass'];
        $mail->SMTPSecure = 'ssl'; // 改为 ssl
        $mail->Port = $mailConfig['smtp_port']; // 465
        
        $mail->setFrom($mailConfig['from'], 'xxx');
        $mail->addAddress($mailConfig['to']);
        $mail->CharSet = 'UTF-8';
        $mail->Encoding = 'base64';
        $mail->ContentType = 'text/html; charset=utf-8';
        
        $mail->isHTML(true);
        $mail->Subject = 'xxx';
        $mail->Body = "
            <h3>xxx</h3>
            <p>xxx：xxx</p>
            <p>xxx：{$username}</p>
            <p>xxx：{$userPhone}</p>
            <p>xxx：" . date('Y-m-d H:i:s') . "</p>
        ";
        
        $mail->send();
    } catch (Exception $e) {
        throw new Exception("邮件发送失败: " . $e->getMessage());
    }

exit;