function FormatAsKey($string){
$string = strtolower($string);
// Fix german special chars
$string = preg_replace('/[äÄ]/', 'ae', $string);
$string = preg_replace('/[üÜ]/', 'ue', $string);
$string = preg_replace('/[öÖ]/', 'oe', $string);
$string = preg_replace('/[ß]/', 'ss', $string);
// Replace other special chars
$specialChars = array(
'sharp' => '#', 'dot' => '.', 'plus' => '+',
'and' => '&', 'percent' => '%', 'dollar' => '$',
'equals' => '=',
);
while(list($replacement, $char) = each($specialChars))
$string = str_replace($char, '-' . $replacement . '-', $string);
$string = strtr(
$string,
"ÀÁÂÃÄÅàáâãäåÒÓÔÕÖØòóôõöøÈÉÊËèéêëÇçÌÍÎÏìíîïÙÚÛÜùúûüÿÑñ",
"AAAAAAaaaaaaOOOOOOooooooEEEEeeeeCcIIIIiiiiUUUUuuuuyNn"
);
// Remove all remaining other unknown characters
$string = preg_replace('/[^a-z0-9\-]/', '-', $string);
$string = preg_replace('/^[\-]+/', '', $string);
$string = preg_replace('/[\-]+$/', '', $string);
$string = preg_replace('/[\-]{2,}/', '-', $string);
return $string;
}
