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PHP – Decode multiple MIME header fields at once using iconv_mime_decode_headers()
In PHP, iconv_mime_decode_headers() function is used to decode multiple MIME header fields at once. It is an in-built function in PHP.
Syntax
iconv_mime_decode_headers($str_headers, $int_mode, $str_encoding)
Parameter
The iconv_mime_decode_headers() function accepts three different parameters− $headers, $mode and $encoding.
$headers − The $header parameter is used for the encoded headers. It is a string type parameter.
$mode − The $mode parameter determines the behavior in the event iconv_mime_decode_headers() encounters a deformed MIME header field. We can use any combination of the following bitmasks.
List of bitmasks acceptable to iconv_mime_decode_headers()
- ICONV_MIME_DECODE_STRICT
- ICONV_MIME_DECODE_CONTINUE_ON_ERROR
- ICONV_MIME_DECODE_STRICT - If the iconv_mime_decode_strict is set, the given header is decoded in full conformance but this option is disabled by default due to a lot of broken mail user agents that do not follow the requirement and do not produce the correct MIME header.
- ICONV_MIME_DECODE_CONTINUE_ON_ERROR - If the iconv_mime_decode_continue_on_error() parameter is set, it tries to ignore any grammatical errors and continues to process a given header.
$encoding − The encoding is an optional parameter that is used to specifies the character set to represent the result. The iconv.internal_encoding will be used if omitted or null.
Return Value
The iconv_mime_decode_headers() function returns an associative array that holds a whole set of MIME header fields specified by headers on success, or it returns False if any error arises during the decoding.
Example 1
<pre> <?php $str_headers = <<<EOF Subject: =?UTF-8?B?UHLDvGZ1bmcgUHLDvGZ1bmc=?= To: xyz@example.com Date: Mon, 21 Jun 2021 00:00:00 +0000 Message-Id: <xyz@example.com> Received: from localhost (localhost [127.0.0.1]) by localhost with SMTP id xyz for <xyz@example.com>; Mon, 21 Jun 2021 00:00:00 +0000 (UTC) (envelope-from example-return-0000-xyz=xyz.com@example.com) Received: (qmail 0 invoked by uid 65534); 21 Mon 2005 00:00:00 +0000 EOF; $headers = iconv_mime_decode_headers($str_headers, 0, "ISO-8859-1"); print_r($headers); ?> </pre>
Output
Array ( [Subject] => Pr�fung Pr�fung [To] => xyz@example.com [Date] => Mon, 21 Jun 2021 00:00:00 +0000 [Message-Id] => [Received] => Array ( [0] => from localhost (localhost [127.0.0.1]) by localhost with SMTP id xyz for ; Mon, 21 Jun 2021 00:00:00 +0000 (UTC) (envelope-from example-return-0000-xyz=xyz.com@example.com) [1] => (qmail 0 invoked by uid 65534); 21 Mon 2005 00:00:00 +0000 ) )
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