用法：
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mb_convert_encoding( $str, $encoding1,$encoding2 );
$str，要轉換編碼文字
$encoding1，目標編碼，如utf-8,big5，大小寫均可
$encoding2，原始編碼，如UTF-8,BIG5，大小寫均可
mb_convert_encoding($str, "UTF-8"); //編碼轉換為utf-8
mb_convert_encoding($str, "UTF-8", "BIG5"); //原始編碼為BIG5轉UTF-8
mb_convert_encoding($str, "UTF-8", "auto"); //原始編碼不明，通過auto自動檢測，轉換UTF-8
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