php怎样发送html格式邮件

要使用PHP发送HTML格式的电子邮件，您可以使用PHPMailer这样的库。以下是使用PHPMailer发送HTML邮件的步骤：

1. 首先，确保已经安装了PHPMailer库。如果还没有安装，可以使用composer进行安装：

composer require phpmailer/phpmailer 

2. 创建一个新的PHP文件，例如send_html_email.php，并在文件中包含autoload文件以及初始化PHPMailer类：

<?php use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\Exception; require 'vendor/autoload.php';  $mail = new PHPMailer(true); 

3. 配置SMTP服务器设置：

try {     //Server settings     $mail->SMTPDebug = 2;               // Enable verbose debug output     $mail->isSMTP();                    // Send using SMTP     $mail->Host       = 'smtp_host';     // Set the SMTP server to send through     $mail->SMTPAuth   = true;          // Enable SMTP authentication     $mail->Username   = 'your_username'; // SMTP username     $mail->Password   = 'your_password'; // SMTP password     $mail->SMTPSecure = 'tls';        // Enable implicit TLS encryption     $mail->Port       = 587;            // TCP port to connect to; use 465 if you have set `SMTPSecure = phpseclib::ENCRYPTION_STARTTLS` 

4. 设置发件人、收件人以及邮件内容：

    //Recipients     $mail->setFrom('your_email@example.com', 'Mailer');     $mail->addAddress('recipient@example.com', 'Joe User');     // Add a recipient      // Content     $mail->isHTML(true);                                 // Set email format to HTML     $mail->Subject = 'Here is the subject';     $mail->Body    = 'This is the HTML message body <b>in bold!</b>';     $mail->AltBody = 'This is the body in plain text for non-HTML mail clients'; 

5. 发送邮件并检查结果：

    $mail->send();     echo 'Message has been sent'; } catch (Exception $e) {     echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}"; } 

6. 完整的代码示例：

<?php use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\Exception; require 'vendor/autoload.php';  $mail = new PHPMailer(true);  try {     //Server settings     $mail->SMTPDebug = 2;               // Enable verbose debug output     $mail->isSMTP();                    // Send using SMTP     $mail->Host       = 'smtp_host';     // Set the SMTP server to send through     $mail->SMTPAuth   = true;          // Enable SMTP authentication     $mail->Username   = 'your_username'; // SMTP username     $mail->Password   = 'your_password'; // SMTP password     $mail->SMTPSecure = 'tls';        // Enable implicit TLS encryption     $mail->Port       = 587;            // TCP port to connect to; use 465 if you have set `SMTPSecure = phpseclib::ENCRYPTION_STARTTLS`      //Recipients     $mail->setFrom('your_email@example.com', 'Mailer');     $mail->addAddress('recipient@example.com', 'Joe User');     // Add a recipient      // Content     $mail->isHTML(true);                                 // Set email format to HTML     $mail->Subject = 'Here is the subject';     $mail->Body    = 'This is the HTML message body <b>in bold!</b>';     $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';      $mail->send();     echo 'Message has been sent'; } catch (Exception $e) {     echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}"; } ?> 

将上述代码中的smtp_host、your_username、your_password、your_email@example.com、recipient@example.com等值替换为您自己的SMTP服务器设置和电子邮件地址。运行此PHP脚本，如果一切配置正确，收件人应该会收到一封包含HTML内容的电子邮件。