DOMElement::getElementsByTagName()

(PHP 5, PHP 7)

Gets elements by tagname

说明

publicDOMElement::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.

参数

$name: The tag name. Use*to return all elements within the element tree.

返回值

This function returns a new instance of the class DOMNodeList of all matched elements.

参见

DOMElement::getElementsByTagNameNS() Get elements by namespaceURI and localName

Be aware that this function returns all descendants, not just immediate children.

Note that even though getElementsByTagName returns a NodeList which is defined as a list of DOMNodes, you're actually getting a list of DOMElements. That allows to call getElementsByTagName on each of the results.
$tables = $doc->getElementsByTagName('table');
foreach ($tables as $table) {
 $trs = $table->getElementsByTagName('tr');
 // etc...
}

A simple function that uses this method to print the nodes it finds in an xml document. Improvements welcomed.
<?php
function printTags($tag){
 $node = $this->doc->getElementsByTagName($tag);      
  for($c = 0; $c<$node->length; $c++){
   $text[$c] =$this->doc->saveXML($node->item($c));
   echo $text[$c];
  }
 
}
?>