PHP 8.4.0 RC4 available for testing

imap_mime_header_decode

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

imap_mime_header_decodeDecode MIME header elements

说明

imap_mime_header_decode(string $string): array|false

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

参数

string

The MIME text

返回值

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.

示例

示例 #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";
}
?>

以上示例会输出:

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.

参见

添加备注

用户贡献的备注 1 note

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9
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;
}
?>
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