imap_mime_header_decode

(PHP 4, PHP 5, PHP 7, PHP 8)

imap_mime_header_decode — Decode MIME header elements

Description

imap_mime_header_decode(string $string): array|false

Decodes MIME message header extensions that are non ASCII text (see » RFC2047).

Parameters

string: The MIME text

Return Values

The decoded elements are returned in an array of objects, where each object has two properties, charset and text.

If the element hasn't been encoded, and in other words is in plain US-ASCII, the charset property of that element is set to default.

The function returns false on failure.

Examples

Example #1 imap_mime_header_decode() example

<?php
$text = "=?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld@example.com>";

$elements = imap_mime_header_decode($text);
for ($i=0; $i<count($elements); $i++) {
    echo "Charset: {$elements[$i]->charset}\n";
    echo "Text: {$elements[$i]->text}\n\n";
}
?>

The above example will output:

Charset: ISO-8859-1
Text: Keld Jørn Simonsen

Charset: default
Text:  <keld@example.com>

In the above example we would have two elements, whereas the first element had previously been encoded with ISO-8859-1, and the second element would be plain US-ASCII.

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User Contributed Notes 1 note

down

Anonymous ¶

11 years ago

A nice way to decode strings is to use the mb_list_encodings(), but I had two problems with it: 
sometimes, the charset is uppercase in the header an lowercase in mb_list_encodings() and sometimes, the charset is not in the mb_list_encodings() list.

<?php
function upperListEncode() { //convert mb_list_encodings() to uppercase
    $encodes=mb_list_encodings();
    foreach ($encodes as $encode) $tencode[]=strtoupper($encode);
    return $tencode;
    }

function decode($string) {
    $tabChaine=imap_mime_header_decode($string);
    $texte='';
    for ($i=0; $i<count($tabChaine); $i++) {
        
        switch (strtoupper($tabChaine[$i]->charset)) { //convert charset to uppercase
            case 'UTF-8': $texte.= $tabChaine[$i]->text; //utf8 is ok
                break;
            case 'DEFAULT': $texte.= $tabChaine[$i]->text; //no convert
                break;
            default: if (in_array(strtoupper($tabChaine[$i]->charset),upperListEncode())) //found in mb_list_encodings()
                        {$texte.= mb_convert_encoding($tabChaine[$i]->text,'UTF-8',$tabChaine[$i]->charset);}
                     else { //try to convert with iconv()
                          $ret = iconv($tabChaine[$i]->charset, "UTF-8", $tabChaine[$i]->text);    
                          if (!$ret) $texte.=$tabChaine[$i]->text;  //an error occurs (unknown charset) 
                          else $texte.=$ret;
                        }                    
                break;
            }
        }
        
    return $texte;    
    }
?>