Recognition of Character Code

gistfile1.php

$tags = get_meta_tags($res->url);
$headers = get_headers($res->url,1);
$ctype = $headers['Content-Type'];
 
if(preg_match('/utf-8|euc-jp|shift_jis|iso-2022-jp/iu',$ctype,$cset)){
 
  switch($cset[0]){
    case 'euc-jp':
    case 'EUC-JP':
      $tag_key  = mb_convert_encoding( $tags['keywords'],   'UTF-8' , 'eucJP-win');
      $tag_desc = mb_convert_encoding( $tags['description'],'UTF-8' , 'eucJP-win');
      break;
 
    case 'shift_jis':
    case 'Shift_JIS':
    case 'SHIFT_JIS':
      $tag_key  = mb_convert_encoding( $tags['keywords'],   'UTF-8' , 'SJIS-win');
      $tag_desc = mb_convert_encoding( $tags['description'],'UTF-8' , 'SJIS-win');
      break;
 
    case 'iso-2022-jp':
      $tag_key  = mb_convert_encoding( $tags['keywords'],   'UTF-8' , 'ISO-2022-JP');
      $tag_desc = mb_convert_encoding( $tags['description'],'UTF-8' , 'ISO-2022-JP');
      break;
 
    case 'utf-8':
    default:
      $tag_key = $tags['keywords'];     // keyword
      $tag_desc = $tags['description']; // description
      break;
  }
}else{
   $tag_key = $tags['keywords'];     // keyword
   $tag_desc = $tags['description']; // description
}