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

用户评论:

[#1] Anonymous [2015-03-21 16:33:43]

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?

[#2] richard dot gildx at gmail dot com [2012-07-29 01:20:23]

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

[#3] sansana [2010-10-14 19:04:57]

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

[#4] syngcw at syncgw.com [2010-01-04 05:53:44]

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

[#5] jintoppy at gmail dot com [2009-04-28 04:13:59]

<?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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