DOMNode::hasChildNodes

(PHP 5, PHP 7, PHP 8)

DOMNode::hasChildNodes — Checks if node has children

Descrizione

public DOMNode::hasChildNodes(): bool

This function checks if the node has children.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Vedere anche:

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

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User Contributed Notes 4 notes

down

sansana ¶

15 years ago

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

down

syngcw at syncgw.com ¶

15 years ago

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

down

richard dot gildx at gmail dot com ¶

13 years ago

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

down

-5

Anonymous ¶

10 years ago

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?

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