https://www.php.net/manual/it/domnodelist.count.php
PHP: DOMNodeList::count - Manual
Get number of nodes in the list
phpcountmanual
https://www.php.net/manual/zh/domnodelist.getiterator.php
PHP: DOMNodeList::getIterator - Manual
Retrieve an external iterator
phpmanual
https://www.php.net/manual/zh/domnodelist.count.php
PHP: DOMNodeList::count - Manual
Get number of nodes in the list
phpcountmanual