Php/docs/function.iconv-mime-encode

• PHP Manual
• iconv 函数
• Composes a MIME header field

iconv_mime_encode

(PHP 5, PHP 7)

iconv_mime_encode — Composes a MIME header field

说明

iconv_mime_encode ( string $field_name , string $field_value [, array $options = [] ] ) : string|false

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 kopfzeile

In 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.

options

You can control the behaviour of iconv_mime_encode() by specifying an associative array that contains configuration items to the optional third parameter options. 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	int	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 "\r\n" (CR LF). Note that this parameter is always treated as an ASCII string regardless of the value of input-charset.	\r\n	\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