Example 1: NFC-normalization of UTF-8 string 'foo'
$normalized = I18N_UnicodeNormalizer::toNFC('foo');
or
$normalizer = new I18N_UnicodeNormalizer();
$normalized = $normalizer->normalize('foo', 'NFC')

Example 2: NFC-normalization of ISO-8859-1 string 'foo'
$normalized = I18N_UnicodeNormalizer::toNFC('foo', 'ISO-8859-1');
or
$normalizer = new I18N_UnicodeNormalizer();
$normalized = $normalizer->normalize('foo', 'NFC', 'ISO-8859-1')
