PHP 手冊
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# LXI. Mail Functions

# 介紹

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.

# 安裝

這些函數是PHP核心的一部分，不需要安裝就可使用。

# 執行時期組態

`php.ini`中的設定會影響這些函數的行為。

表格 1. Mail configuration options

Name | Default | Changeable
--- | --- | ---
SMTP | "localhost" | PHP_INI_ALL
smtp_port | "25" | PHP_INI_ALL
sendmail_from | NULL | PHP_INI_ALL
sendmail_path | DEFAULT_SENDMAIL_PATH | PHP_INI_SYSTEM

For further details and definitions of the PHP_INI_* constants, see the 附錄 H.

這裡為簡短的結構指令說明。

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.

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

這個延伸沒有定義任何常數。

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