/ Published in: PHP
ISO-8859-1 (Latin 1) full with all special characters:
results in
TRY THIS: ÄÖÜß
results in
TRY THIS: ÄÖÜß
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<?php function fullUpper($str){ // convert to entities $pattern = '/&([a-z])(uml|acute|circ'; $pattern.= '|tilde|ring|elig|grave|slash|horn|cedil|th);/e'; $replace = "'&'.strtoupper('\\1').'\\2'.';'"; // convert from entities back to characters foreach($htmltable as $key => $value) { } } echo fullUpper("try this: äöüß"); ?>