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Use the iconv_mime_encode() function to build a PHP code for a MIME header field

王林
王林forward
2023-08-28 12:53:06907browse

Use the iconv_mime_encode() function to build a PHP code for a MIME header field

In PHP, the iconv_mime_encode() function is used to compose MIME header fields. This is a built-in PHP function.

Syntax

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

iconv_mime_encode() The function is used to combine and return a string representing a valid MIME header field as shown below-

Subject: =ISO-8859-1?Q?Pr=FCfung_f=FFCr?= Entwerfen von einer MIME kopfzeile

Note -In the above example, Subject - is the field name, ending with "=ISO-8859-1?..."# The part starting with ## is the field value.

Parameters

iconv_mime_encode()Accepts three different parameters− $field_name, $field_value, and $options.

  • $field_name - This parameter is used for the field name.

  • #$field_value - This parameter is used for the field value.

  • $options - Using this parameter, you can control the behavior of iconv_mime_encode() by specifying an associative array that contains configuration of optional parameters item.

The following is a list of configuration items supported by

iconv_mime_encode()

StringSpecify the maximum length of the header line. 76It specifies the sequence of characters to append to each line as EOL when performing folding on long header fields. If not given, defaults to "\r##\r Output
project type Description Default value Example Scheme

This scheme specifies the method for encoding field values. The item value can be B (base64) or Q (quoted-printable) encoding scheme.

# #Input character set

String

Specifies the character set, field_name is the first parameters, field_value is the second parameter. If these arguments are not given, the iconv_mime_encode() function assumes that it may be present in the iconv.internal_charset ini setting.

iconv.internal_charset

 ##ISO-8859-1

Output character set

String
It specifies the character set used to make up the MIME header. If not given, it will use the input character set value.

input_charset is used as the default value

 ##UTF-8

Line length

 ##Integer

##996

Line break

 String
" (CR LF)

##Example 1 - Use "Q" quotes to print the encoding scheme

Live Demo 

<?php
   // used configuration items supported by iconv_mime_encode()
   $options = array(
      "input-charset" => "ISO-8859-2",
      "output-charset" => "UTF-8",
      "line-length" => 76,
      "line-break-chars" => ""
   );
   // Q quoted-printable encoding scheme is used
   $options["scheme"] = "Q";

   // Below code will show the result as
   // "Subject: =?UTF-8?Q?Pr=C3=BCfung=20Pr=C3=BCfung?="
   echo iconv_mime_encode("Subject", "Pr&uuml;fung Pr&uuml;fung", $options);
?>

Subject: =?UTF-8?Q?Pr=C3=83=C2=BCfung=20Pr=C3=83=C2=BCfung?=
Example 2

Live Demo 

<?php
   // used configuration items supported by iconv_mime_encode()
   $options = array(
      "input-charset" => "ISO-8859-1",
      "output-charset" => "UTF-8",
      "line-length" => 76,
      "line-break-chars" => ""
   );

   // B base64 encoding scheme is used
   $options["scheme"] = "B";

   // Below code will show the result as
   //"Subject: =?UTF-8?B?UHJlw4PCp29zIE9sw4PCoC50eHQ=?="
   echo iconv_mime_encode("Subject", "Pre&ccedil;os Ol&agrave;.txt", $options);
?>

Output

Subject: =?UTF-8?B?UHJlw4PCp29zIE9sw4PCoC50eHQ=?=

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