iconv_mime_encode
(PHP 5)
iconv_mime_encode — Composes a MIME header field
说明
string iconv_mime_encode
( string $field_name
, string $field_value
[, array $preferences = NULL
] )
Composes and returns a string that represents a valid MIME header field, which looks like the following:
Subject: =?ISO-8859-1?Q?Pr=FCfung_f=FCr?= Entwerfen von einer MIME kopfzeileIn the above example, "Subject" is the field name and the portion that begins with "=?ISO-8859-1?..." is the field value.
参数
field_name
The field name.
field_value
The field value.
preferences
You can control the behaviour of iconv_mime_encode()
by specifying an associative array that contains configuration items
to the optional third parameter preferences.
The items supported by iconv_mime_encode() are
listed below. Note that item names are treated case-sensitive.
Configuration items supported by iconv_mime_encode()
Item
Type
Description
Default value
Example
scheme
string
Specifies the method to encode a field value by. The value of
this item may be either "B" or "Q", where "B" stands for
base64 encoding scheme and "Q" stands for
quoted-printable encoding scheme.
B
B
input-charset
string
Specifies the character set in which the first parameter
field_name and the second parameter
field_value are presented. If not given,
iconv_mime_encode() assumes those parameters
are presented to it in the
iconv.internal_encoding
ini setting.
iconv.internal_encoding
ISO-8859-1
output-charset
string
Specifies the character set to use to compose the
MIME header.
iconv.internal_encoding
UTF-8
line-length
integer
Specifies the maximum length of the header lines. The resulting
header is "folded" to a set of multiple lines in case
the resulting header field would be longer than the value of this
parameter, according to
» RFC2822 - Internet Message Format.
If not given, the length will be limited to 76 characters.
76
996
line-break-chars
string
Specifies the sequence of characters to append to each line
as an end-of-line sign when "folding" is performed on a long header
field. If not given, this defaults to "rn"
(CR LF). Note that
this parameter is always treated as an ASCII string regardless
of the value of input-charset.
rn
n
返回值
Returns an encoded MIME field on success,
or FALSE if an error occurs during the encoding.
范例
Example #1 iconv_mime_encode() example
<?php
$preferences = array(
"input-charset" => "ISO-8859-1",
"output-charset" => "UTF-8",
"line-length" => 76,
"line-break-chars" => "n"
);
$preferences["scheme"] = "Q";
// This yields "Subject: =?UTF-8?Q?Pr=C3=BCfung=20Pr=C3=BCfung?="
echo iconv_mime_encode("Subject", "Prüfung Prüfung", $preferences);
$preferences["scheme"] = "B";
// This yields "Subject: =?UTF-8?B?UHLDvGZ1bmcgUHLDvGZ1bmc=?="
echo iconv_mime_encode("Subject", "Prüfung Prüfung", $preferences);
?>
参见
imap_binary() - Convert an 8bit string to a base64 string mb_encode_mimeheader() - 为 MIME 头编码字符串 imap_8bit() - Convert an 8bit string to a quoted-printable string quoted_printable_encode() - 将 8-bit 字符串转换成 quoted-printable 字符串