DOMNode::hasChildNodes

(PHP 5, PHP 7)

DOMNode::hasChildNodes — Checks if node has children

说明

public bool DOMNode::hasChildNodes ( void )

This function checks if the node has children.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

参见

DOMNode::hasAttributes() - Checks if node has attributes

User Contributed Notes

Anonymous 22-Mar-2015 01:33


Hi what if its a dynamic file and we cannot use get elements by tag name then how do we print the contents of all level tags?

richard dot gildx at gmail dot com 29-Jul-2012 10:20


This "hasChildNodes()" exercise is simple enough to make it clear and understandable. Or, you could take it as a tag empty check. By Richard Holm, Sweden.



<?php

$xmldoc=

'<?xml version="1.0" ?>

<root>

<text>Text</text>

<none/>

<empty></empty>

<space> </space>

</root>';



$domdoc=new DOMDocument();

$domdoc->loadXML($xmldoc);



$tag=$domdoc->getElementsByTagName('root')->item(0);

$v=$tag->hasChildNodes()?" hasChildNodes":" hasNoChildNodes";

echo $tag->tagName.$v."<br/>";



$tag=$domdoc->getElementsByTagName('text')->item(0);

$v=$tag->hasChildNodes()?" hasChildNodes":" hasNoChildNodes";

echo $tag->tagName.$v."<br/>";



$tag=$domdoc->getElementsByTagName('none')->item(0);

$v=$tag->hasChildNodes()?" hasChildNodes":" hasNoChildNodes";

echo $tag->tagName.$v."<br/>";



$tag=$domdoc->getElementsByTagName('empty')->item(0);

$v=$tag->hasChildNodes()?" hasChildNodes":" hasNoChildNodes";

echo $tag->tagName.$v."<br/>";



$tag=$domdoc->getElementsByTagName('space')->item(0);

$v=$tag->hasChildNodes()?" hasChildNodes":" hasNoChildNodes";

echo $tag->tagName.$v."<br/>";

?>



Output:

root hasChildNodes

text hasChildNodes

none hasNoChildNodes

empty hasNoChildNodes

space hasChildNodes

sansana 15-Oct-2010 04:04


Personally I think using a simple:[code]if($DOMNode->childNodes <>0){}[/code] works better.

syngcw at syncgw.com 04-Jan-2010 02:53


This function is a bit tricky. If you want to find XML childnodes it is useless. You need to create a work-around:



<?php



$x = new DOMDocument();

$x->loadXML('

<A>

 <B>b-text</B>

 <C>

  <D>d-text</D>

 </C>

 <E/>

</A>');



shownode($x->getElementsByTagName('A')->item(0));

function shownode($x) {

 foreach ($x->childNodes as $p)

  if (hasChild($p)) {

      echo $p->nodeName.' -> CHILDNODES<br>';

      shownode($p);

  } elseif ($p->nodeType == XML_ELEMENT_NODE)

   echo $p->nodeName.' '.$p->nodeValue.'<br>';

}

function hasChild($p) {

 if ($p->hasChildNodes()) {

  foreach ($p->childNodes as $c) {

   if ($c->nodeType == XML_ELEMENT_NODE)

    return true;

  }

 }

 return false;

}



?>



shows:

B b-text

C -> CHILDNODES

D d-text

E

jintoppy at gmail dot com 28-Apr-2009 01:13


<?php



$doc = new DOMDocument;

$node = $doc->createElement("FirstMain", "First Main Node. This have child");

$doc->appendChild($node);

$childnode = $doc->createElement("childnode", "child node");

$node->appendChild($childnode);

$secondnode = $doc->createElement("SecondMain", "First Main Node. This don't have child");

$doc->appendChild($secondnode);

$doc->saveXML();

$nodeElmt = $doc->getElementsByTagName("FirstMain");

/*

if given as $nodeElmt = $doc->getElementsByTagName("childnode");

the output would be "This node has childnodes"



if given as $nodeElmt = $doc->getElementsByTagName("SecondMain");

the output would be "This node has no childnodes"



*/



foreach($nodeElmt as $nodeElmt)

{

if($nodeElmt->hasChildNodes())

{

echo "This node has childnodes";

}

else

{

echo "This node has no childnodes";

}

}



  ?>



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Output:



This node has childnodes



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