PHP - How to decode MIME header fields using iconv_mime_decode() function?

In PHP, the iconv_mime_decode() function is used to decode MIME header fields. This is a built-in function in PHP and is available starting with PHP 5 version.

Syntax

String iconv_mime_decode(string $string, int $mode, string $encoding)

Parameters

iconv_mime_decode() Accepts three different parameters - $string, $ mode and $encoding. $string and $mode are mandatory parameters, but $encoding is optional.

• $string - The $string parameter is used to encode the header. It is a string type parameter.

• $mode - The $mode parameter determines the behavior of iconv_mime_decode() when it encounters a malformed MIME header field. We can specify any combination of the bitmasks given below.

  iconsv_mime_decode_headers() List of acceptable bit masks

  • ICONV_MIME_DECODE_STRICT
  • ##ICONV_MIME_DECODE_CONTINUE_ON_ERROR

  • ICONV_MIME_DECODE_STRICT - If

    iconv_mime_decode_strict is set, the given header fully complies with the decoding requirements, but as many broken mail user agents do not follow the requirements and do not generate the correct MIME header, so this option is disabled by default.

  • ICONV_MIME_DECODE_CONTINUE_ON_ERROR

    − If the iconv_mime_decode_continue_on_error() parameter is set, it will attempt to ignore any syntax errors and continue processing the given header.

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• $encoding - Encoding is an optional parameter that specifies the character set used to represent the result. If omitted or null, iconv.internal_encoding will be used.

Return Value

iconv_mime_decode() The function returns a MIME field that is successfully decoded, or False if any errors occur during decoding.

Example

Real-time demonstration

<?php
   // This yields "Sub: Pre&ccedil;os Ol&agrave;.txt"
   echo iconv_mime_decode("Sub: =?utf-8?B?UHJlw4PCp29zIE9sw4PCoA==?=.txt ",
   0, "ISO-8859-1");
?>

Output

Sub: Preços Olà.txt

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