php mb_convert_encoding字串編碼

1介紹  mb_convert_encoding( $str, $encoding1,$encoding2 )  $str，要轉換編碼的字串  $encoding1，目標編碼，如utf-8,gbk，大小寫均可  $encoding2，原編碼，如utf-8,gbk，大小寫均可  2執行個體1  <?php$str='編碼';  echo mb_convert_encoding($str, "UTF-8"); //編碼轉換為utf-8  ?>  3執行個體2  <?php$str='編碼';  echo mb_convert_encoding($str, "UTF-8", "GBK"); //已知原編碼為GBK，轉換為utf-8  ?>  4執行個體3  <?php$str='編碼';  echo mb_convert_encoding($str, "UTF-8", "auto"); //未知原編碼，通過auto自動檢測後，轉換編碼為utf-8  ?>