Call to function is_int() with int will always evaluate to true.

Method Kitodo\Dlf\Common\MetsDocument::getStructureDepth() never returns bool so it can be removed from the return type.

Property Kitodo\Dlf\Common\Solr\SearchResult\ResultDocument::$snippets (string|null) is never assigned null so it can be removed from the property type.

PHPDoc tag @return has invalid value (array(Page) All result's pages which contain search phrase): Unexpected token "(", expected TOKEN_HORIZONTAL_WS at offset 119 on line 6

PHPDoc tag @return has invalid value (array(Region) All result's regions which contain search phrase): Unexpected token "(", expected TOKEN_HORIZONTAL_WS at offset 121 on line 6

PHPDoc tag @return has invalid value (array(Highlight) All result's highlights of search phrase): Unexpected token "(", expected TOKEN_HORIZONTAL_WS at offset 113 on line 6

PHPDoc tag @return has invalid value (array(string) All result's highlights of search phrase): Unexpected token "(", expected TOKEN_HORIZONTAL_WS at offset 118 on line 6

PHPDoc tag @var has invalid value (array(Solr) This holds the singleton search objects with their core as array key): Unexpected token "(", expected TOKEN_HORIZONTAL_WS at offset 46 on line 3

PHPDoc tag @SuppressWarnings has invalid value ((PHPMD.UnusedPrivateMethod)): Unexpected token ".UnusedPrivateMethod)", expected ')' at offset 88 on line 3