我使用codeigniter电子邮件库时出错

虽然电子邮件发送成功，但我得到了一个错误列表：

A PHP Error was encountered

Severity: Warning

Message: mail(/var/log/php-mail.log): failed to open stream: Permission denied

Filename: libraries/Email.php

Line Number: 1553

以及：

以及：

---

我的代码怎么了？！我能做点什么吗

在php.ini文件中应该有一个mail.log条目，它应该记录所有mail（）函数调用。有关详细信息，请查看phpinfo（）对mail.log的说明

您是否具有正确的阅读权限，以及发送后是否更新了标题？

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at system/core/Exceptions.php:185)

Filename: libraries/Session.php

Line Number: 675

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at system/core/Exceptions.php:185)

Filename: helpers/url_helper.php

Line Number: 542