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<?php function _unicode_caseflip($matches) { return $matches[0][0] . chr(ord($matches[0][1]) ^ 32); } function drupal_strtolower($text, $multibyte_unicode) { if ($multibyte_unicode) { return mb_strtolower($text); } else { // Use C-locale for ASCII-only lowercase $text = strtolower($text); // Case flip Latin-1 accented letters $text = preg_replace_callback('/\xC3[\x80-\x96\x98-\x9E]/', '_unicode_caseflip', $text); return $text; } } $arr = []; $arr[] = drupal_strtolower(TRUE, TRUE); $arr[] = drupal_strtolower(TRUE, FALSE); $arr[] = drupal_strtolower(FALSE, TRUE); $arr[] = drupal_strtolower(FALSE, FALSE); $arr[] = (bool)drupal_strtolower(TRUE, TRUE); $arr[] = (bool)drupal_strtolower(TRUE, FALSE); $arr[] = (bool)drupal_strtolower(FALSE, TRUE); $arr[] = (bool)drupal_strtolower(FALSE, FALSE); var_export($arr);