iconv_mime_encode()

(PHP 5, PHP 7)

Composes aMIMEheader field

说明

iconv_mime_encode(string $field_name,string $field_value[,array $preferences= NULL]): string

Composes and returns a string that represents a validMIMEheader 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.

$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 forbase64encoding scheme and "Q" stands forquoted-printableencoding scheme.	B	B
input-charset	string	Specifies the character set in which the first parameter$field_nameand the second parameter$field_valueare 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 theMIMEheader.	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"(CRLF). Note that this parameter is always treated as an ASCII string regardless of the value ofinput-charset.	rn	n

返回值

Returns an encodedMIMEfield on success, or FALSE if an error occurs during the encoding.

范例

iconv_mime_encode() example

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

iconv_mime_encode() isn't directly suitable for encoding headers which include "specials" as described in RFC 1522 s4 & s5, for example 

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