iconv_mime_decode_headers

(PHP 5, PHP 7, PHP 8)

iconv_mime_decode_headers — 一次性解码多个 MIME 头字段

说明

iconv_mime_decode_headers(string $headers, int $mode = 0, ?string $encoding = null): array|false

一次性解码多个 MIME 头字段。

参数

headers

编码过的头，是一个字符串。

mode

mode 决定了 iconv_mime_decode_headers() 遇到畸形 MIME 头字段时的行为。你可以指定为以下位掩码的任意组合。

**iconv_mime_decode_headers()** 接受的位掩码
值	常量	描述
1	ICONV_MIME_DECODE_STRICT	如果设置了，给定的头将会以 » RFC2047 定义的标准完全一致。这个选项默认禁用，因为大量有问题的邮件用户代理不遵循标准并产生不正确的 `MIME` 头。
2	ICONV_MIME_DECODE_CONTINUE_ON_ERROR	如果设置了，iconv_mime_decode_headers() 尝试忽略任何语法错误并继续处理指定的头。

encoding

可选参数 encoding 指定了字符集结果的表现。如果省略或为 null，将使用 iconv.internal_encoding。

返回值

成功时返回 headers 指定的 MIME 头的整套关联数组，解码时出现错误则返回 false。

返回元素的每个键代表独立字段名，相应的元素代表一个字段值。如果有多个同一名称的字段，iconv_mime_decode_headers() 自动将他们按出现顺序结合成数字索引的数组。请注意，标头名称不区分大小写。

更新日志

版本	说明
8.0.0	`encoding` 现在可为 null。

示例

示例 #1 iconv_mime_decode_headers() 示例

<?php
$headers_string = <<<EOF
Subject: =?UTF-8?B?UHLDvGZ1bmcgUHLDvGZ1bmc=?=
To: example@example.com
Date: Thu, 1 Jan 1970 00:00:00 +0000
Message-Id: <example@example.com>
Received: from localhost (localhost [127.0.0.1]) by localhost
    with SMTP id example for <example@example.com>;
    Thu, 1 Jan 1970 00:00:00 +0000 (UTC)
    (envelope-from example-return-0000-example=example.com@example.com)
Received: (qmail 0 invoked by uid 65534); 1 Thu 2003 00:00:00 +0000

EOF;

$headers =  iconv_mime_decode_headers($headers_string, 0, "ISO-8859-1");
print_r($headers);
?>

以上示例会输出：

Array
(
    [Subject] => Prüfung Prüfung
    [To] => example@example.com
    [Date] => Thu, 1 Jan 1970 00:00:00 +0000
    [Message-Id] => <example@example.com>
    [Received] => Array
        (
            [0] => from localhost (localhost [127.0.0.1]) by localhost with SMTP id example for <example@example.com>; Thu, 1 Jan 1970 00:00:00 +0000 (UTC) (envelope-from example-return-0000-example=example.com@example.com)
            [1] => (qmail 0 invoked by uid 65534); 1 Thu 2003 00:00:00 +0000
        )

)

参见

iconv_mime_decode() - 解码一个MIME头字段
mb_decode_mimeheader() - 解码 MIME 头字段中的字符串
imap_mime_header_decode() - Decode MIME header elements
imap_base64() - Decode BASE64 encoded text
imap_qprint() - Convert a quoted-printable string to an 8 bit string

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＋添加备注

用户贡献的备注 2 notes

down

phpmanual at NOSPAM dot headbank dot co dot uk ¶

22 days ago

Just in case this catches anyone else: If your headers string has any leading linebreaks, this function will reject it and return an empty array. If that might apply to your input, sanitise it with ltrim().

Trailing empty lines are tolerated/ignored.

Other quirks I noticed just now:

1. Leading whitespace (" " or "\t") in the *first* line will be included in the header's key name in the returned array. ltrim() will prevent that too.

2. Leading whitespace in any subsequent header (before the key) will cause that line to be appended to the preceding header's value, as though it were a run-on of that header.

down

TheConstructor ¶

14 years ago

If you need lower-case header-names (as I read the documentation case is not guranteed) try something like

<?php

$headers_string = <<<EOF
Subject: =?UTF-8?B?UHLDvGZ1bmcgUHLDvGZ1bmc=?=
To: example@example.com
Date: Thu, 1 Jan 1970 00:00:00 +0000
Message-Id: <example@example.com>
Received: from localhost (localhost [127.0.0.1]) by localhost
    with SMTP id example for <example@example.com>;
    Thu, 1 Jan 1970 00:00:00 +0000 (UTC)
    (envelope-from example-return-0000-example=example.com@example.com)
Received: (qmail 0 invoked by uid 65534); 1 Thu 2003 00:00:00 +0000

EOF;

$headers =  iconv_mime_decode_headers($headers_string, 0, "ISO-8859-1");

$headers = array_combine(array_map("strtolower", array_keys($headers)), array_values($headers));

print_r($headers);
?>