先用函数base64_encode() — 使用 MIME base64 对数据进行编码
标题字符串前加编码类型例如： =?UTF-8?B?
标题字符串后加：?=
邮件header指明Content-type: text/html; charset=utf-8，这样就能防止邮件正文乱码
$to = ‘zhoz@example.com’;
$subject = “=?UTF-8?B?”.base64_encode(‘邮件标题’).”?=”;
$headers = ‘MIME-Version: 1.0’ . “rn”;
$headers .= ‘Content-type: text/html; charset=utf-8’ . “rn”;
// Additional headers
$headers .= ‘To: zhoz <zhoz@example.com>’ . “rn”;
$headers .= ‘From: Admin <admin@example.com>’ . “rn”;
$headers .= ‘Reply-To: zhoz <zhoz@example>’ . “rn”;
mail($to, $subject, $message, $headers);
$subject = “=?UTF-8?B?”.base64_encode(‘邮件标题’).”?=”;
$headers = ‘MIME-Version: 1.0’ . “rn”;
$headers .= ‘Content-type: text/html; charset=utf-8’ . “rn”;
// Additional headers
$headers .= ‘To: zhoz <zhoz@example.com>’ . “rn”;
$headers .= ‘From: Admin <admin@example.com>’ . “rn”;
$headers .= ‘Reply-To: zhoz <zhoz@example>’ . “rn”;
mail($to, $subject, $message, $headers);
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