如何否定xpath查詢？

Question

我願做一個負XPath查詢這樣的：

$xpath->query(//a[DoesNotContain(@class,'some_class')]); 

我知道這個

$xpath->query(//a[contains(@class,'some_class')]); 

Answer 1

$xpath->query(//a[not(contains(@class, 'some_class'))]);