(PHP 5, PHP 7)
DOMElement::getElementsByTagName — Gets elements by tagname
public DOMElement::getElementsByTagName ( string $name ) : DOMNodeList
 This function returns a new instance of the class DOMNodeList of all descendant elements with a given tag name, in the order in which they are encountered in a preorder traversal of this element tree. 
name
 The tag name. Use * to return all elements within the element tree. 
This function returns a new instance of the class DOMNodeList of all matched elements.
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    https://www.php.net/manual/en/domelement.getelementsbytagname.php