String auf UTF-8 überprüfen

if ($content === mb_convert_encoding(mb_convert_encoding($content, "UTF-32", "UTF-8"), "UTF-8", "UTF-32")) {
    $content = utf8_encode($content);
} else {
}
Hier gefunden: http://us3.php.net/manual/en/function.mb-detect-encoding.php#68893
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