DOMNode::hasChildNodes

(PHP 5, PHP 7, PHP 8)

DOMNode::hasChildNodes — ノードが子を保持しているかどうかを調べる

説明

public DOMNode::hasChildNodes(): bool

この関数は、ノードが子を保持しているかどうかを調べます。

パラメータ

この関数にはパラメータはありません。

戻り値

成功した場合に true を、失敗した場合に false を返します。

参考

DOMNode::hasAttributes() - ノードが属性を保持しているかどうかを調べる

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User Contributed Notes 4 notes

down

sansana ¶

14 years ago

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

down

syngcw at syncgw.com ¶

14 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 ¶

12 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 ¶

9 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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