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Uppercasing with special characters

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ISO-8859-1 (Latin 1) full with all special characters:
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TRY THIS: ÄÖÜß

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  1. <?php
  2. function fullUpper($str){
  3.    // convert to entities
  4.    $subject = htmlentities($str,ENT_QUOTES);
  5.    $pattern = '/&([a-z])(uml|acute|circ';
  6.    $pattern.= '|tilde|ring|elig|grave|slash|horn|cedil|th);/e';
  7.    $replace = "'&'.strtoupper('\\1').'\\2'.';'";
  8.    $result = preg_replace($pattern, $replace, $subject);
  9.    // convert from entities back to characters
  10.    $htmltable = get_html_translation_table(HTML_ENTITIES);
  11.    foreach($htmltable as $key => $value) {
  12.       $result = ereg_replace(addslashes($value),$key,$result);
  13.    }
  14.    return(strtoupper($result));
  15. }
  16.  
  17. echo fullUpper("try this: äöüß");
  18. ?>

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