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iconv_mime_decode

Description

The iconv_mime_decode of iconv for PHP decodes a MIME header field.

Syntax

iconv_mime_decode(
    string $string,
    int $mode = 0,
    ?string $encoding = null
): string|false

Parameters

string

The encoded header, as a string.

mode

The mode determines the behaviour in the event iconv_mime_decode() encounters a malformed MIME header field. You can specify any combination of the following bitmasks:

ValueConstantDescription
1ICONV_MIME_DECODE_STRICTIf set, the given header is decoded in full conformance with the standards defined in RFC2047. This option is disabled by default because there are a lot of broken mail user agents that don't follow the specification and don't produce correct MIME headers.
2ICONV_MIME_DECODE_CONTINUE_ON_ERRORIf set, iconv_mime_decode_headers() attempts to ignore any grammatical errors and continue to process a given header.

encoding

The optional encoding parameter specifies the character set to represent the result by. If omitted or null, iconv.internal_encoding will be used.

Return

Returns a decoded MIME field on success, or false if an error occurs during the decoding.

Examples

1 · string

<?

$field_name = "subject";
$field_value = "my·subject";

$iconv_mime_encode = iconv_mime_encode($field_name, $field_value);

echo $iconv_mime_encode . PHP_EOL;

$string = $iconv_mime_encode;

$return = iconv_mime_decode($string);
 
echo $return;

?>
subject: =?UTF-8?B?bXnCt3N1YmplY3Q=?=
subject: my·subject

2 · mode · 0

<?

$field_name = "subject";
$field_value = "my·subject";

$iconv_mime_encode = iconv_mime_encode($field_name, $field_value);

echo $iconv_mime_encode . PHP_EOL;

$string = $iconv_mime_encode;
$mode = 0;

$return = iconv_mime_decode($string, $mode);
 
echo $return;

?>
subject: =?UTF-8?B?bXnCt3N1YmplY3Q=?=
subject: my·subject

3 · mode · 1

<?

$field_name = "subject";
$field_value = "my·subject";

$iconv_mime_encode = iconv_mime_encode($field_name, $field_value);

echo $iconv_mime_encode . PHP_EOL;

$string = $iconv_mime_encode;
$mode = 1;

$return = iconv_mime_decode($string, $mode);
 
echo $return;

?>
subject: =?UTF-8?B?bXnCt3N1YmplY3Q=?=
subject: my·subject

4 · mode · 2

<?

$field_name = "subject";
$field_value = "my·subject";

$iconv_mime_encode = iconv_mime_encode($field_name, $field_value);

echo $iconv_mime_encode . PHP_EOL;

$string = $iconv_mime_encode;
$mode = 2;

$return = iconv_mime_decode($string, $mode);
 
echo $return;

?>
subject: =?UTF-8?B?bXnCt3N1YmplY3Q=?=
subject: my·subject

5 · encoding

<?

$field_name = "subject";
$field_value = "my·subject";

$iconv_mime_encode = iconv_mime_encode($field_name, $field_value);

echo $iconv_mime_encode . PHP_EOL;

$string = $iconv_mime_encode;
$mode = 0;
$encoding = "ISO-8859-1";

$return = iconv_mime_decode($string, $mode, $encoding);
 
echo $return;

?>
subject: =?UTF-8?B?bXnCt3N1YmplY3Q=?=
subject: my�subject
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