PHP Manual
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# LXII. Mail Functions

# 简介

The mail() function allows you to send mail.

# 需求

For the Mail functions to be available, PHP must have access to the sendmail binary on your system during compile time. If you use another mail program, such as qmail or postfix, be sure to use the appropriate sendmail wrappers that come with them. PHP will first look for sendmail in your PATH, and then in the following: /usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib. It's highly recommended to have sendmail available from your PATH. Also, the user that compiled PHP must have permission to access the sendmail binary.

# 安装

这些函数作为 PHP 核心的一部分，无需被安装即可使用。

# 运行时配置

这些函数的行为受 `php.ini` 的影响。

表格 1. Mail configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
SMTP | "localhost" | PHP_INI_ALL |
smtp_port | "25" | PHP_INI_ALL | Available since PHP 4.3.0.
sendmail_from | NULL | PHP_INI_ALL |
sendmail_path | NULL | PHP_INI_SYSTEM |

有关 PHP_INI_* 常量进一步的细节与定义参见 附录 H。

以下是该配置选项的简要解释。

SMTP string

  Used under Windows only: DNS name or IP address of the SMTP server PHP should use for mail sent with the mail() function.

smtp_port int

  Used under Windows only: Number of the port to connect to the server specified with the SMTP setting when sending mail with mail(); defaults to 25. Only available since PHP 4.3.0.

sendmail_from string

  Which "From:" mail address should be used in mail sent from PHP under Windows.

sendmail_path string

  Where the sendmail program can be found, usually `/usr/sbin/sendmail` or `/usr/lib/sendmail`. configure does an honest attempt of locating this one for you and set a default, but if it fails, you can set it here.

  Systems not using sendmail should set this directive to the sendmail wrapper/replacement their mail system offers, if any. For example, Qmail users can normally set it to `/var/qmail/bin/sendmail` or `/var/qmail/bin/qmail-inject`.

  qmail-inject does not require any option to process mail correctly.

  This directive works also under Windows. If set, smtp, smtp_port and sendmail_from are ignored and the specified command is executed.

# 资源类型

本扩展模块未定义任何资源类型。

# 预定义常量

本扩展模块未定义任何常量。

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