Convert::toIso() 

\nn\t3::Convert()->toIso(); 

Converts (normalizes) a string to ISO-8859-1

\nn\t3::Convert('ÖÜÜ')->toIso();
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| @return string

Source Code 

public function toIso() {
	$input = $this->initialArgument;
	$input = html_entity_decode($input);
	if (function_exists('iconv')) {
		$input = iconv('UTF-8', 'ISO-8859-1', $input);
	}
	return $input;
}
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