public static function remove_duplicate_authors($author_words1, $author_words2)
{
$unique_authors1 = $author_words1;
$unique_authors2 = $author_words2;
//print_r($author_words1);
//print_r($author_words2);
foreach ($author_words1 as $key1 => $author1) {
$author1_matches = false;
$author1 = Normalize::normalize_author_string($author1);
foreach ($author_words2 as $key2 => $author2) {
$author2_matches = false;
$author2 = Normalize::normalize_author_string($author2);
if ($author1 == $author2) {
//echo '$1';
$author1_matches = true;
$author2_matches = true;
} elseif (preg_match("/^" . preg_quote($author1, "/") . "/i", $author2)) {
//echo '$2';
$author1_matches = true;
} elseif (preg_match("/^" . preg_quote($author2, "/") . "/i", $author1)) {
//echo '$3';
$author2_matches = true;
}
// equal or one is contained in the other, so consider it a match for both terms
if (strlen($author1) >= 3 && $author1_matches || strlen($author2) >= 3 && $author2_matches || $author1 == $author2) {
//echo '$4';
unset($unique_authors1[$key1]);
unset($unique_authors2[$key2]);
} elseif ($author1_matches) {
//echo '$5';
// author1 was abbreviation of author2
unset($unique_authors1[$key1]);
} elseif ($author2_matches) {
//echo '$6';
// author1 was abbreviation of author2
unset($unique_authors2[$key2]);
} else {
//echo '$7';
// no match or abbreviation so try a fuzzy match
// $max_length = max(strlen($author1), strlen($author2));
// $lev = levenshtein($author1, $author2);
// if(($lev/$max_length) <= .167)
$match = self::match_author_words($author1, $author2);
if ($match['match']) {
//echo '$8';
unset($unique_authors1[$key1]);
unset($unique_authors2[$key2]);
}
}
}
reset($author_words2);
}
return array($unique_authors1, $unique_authors2);
}
