slug.slug.php

<?php

/*
 * This is meant to be a port of the Python `slug.slug()` method, the
 * source of which is as follows:
 *
 * value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
 * value = re.sub('[^\w\s-]', '', value.decode('utf-8')).strip().lower()
 * return re.sub('[-\s]+', '-', value)
 */
function python_slug( $str ) {
  $str = Normalizer::normalize( $str, Normalizer::FORM_KD );
  $str = preg_replace( '~[\x00-\x1F\x80-\xFF]~', '', $str );
  $str = preg_replace( '~[^\w\s-]~', '', $str );
  $str = strtolower( trim( $str ) );
  return preg_replace( '~[-\s]+~', '-', $str );
}