PHP - Manual: DOMElement::setAttribute

2024-12-21

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DOMElement::setAttribute

(PHP 5, PHP 7, PHP 8)

DOMElement::setAttribute — Adds new or modifies existing attribute

说明

public DOMElement::setAttribute(string $qualifiedName, string $value): DOMAttr|bool

Sets an attribute with name qualifiedName to the given value. If the attribute does not exist, it will be created.

参数

qualifiedName: The name of the attribute.
value: The value of the attribute.

返回值

The created or modified DOMAttr or false if an error occurred.

错误／异常

DOM_NO_MODIFICATION_ALLOWED_ERR: Raised if the node is readonly.

范例

示例 #1 Setting an attribute


<?php
$doc = new DOMDocument("1.0");
$node = $doc->createElement("para");
$newnode = $doc->appendChild($node);
$newnode->setAttribute("align", "left");
?>

参见

DOMElement::hasAttribute() - Checks to see if attribute exists
DOMElement::getAttribute() - Returns value of attribute
DOMElement::removeAttribute() - Removes attribute

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User Contributed Notes 6 notes

down

Rakesh Verma - rakeshnsony at gmail dot com ¶

11 years ago


<?php
//Store your html into $html variable.
$html="
<html>
<head>
<title>Untitled Document</title>
</head>

<body>
    <a href='http://example.com'>Example</a><br>
    <a href='http://google.com'>Google</a><br>
    
    <a href='http://www.yahoo.com'>Yahoo</a><br>
</body>

</html>";

$dom = new DOMDocument();
$dom->loadHTML($html);

//Evaluate Anchor tag in HTML
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");

for ($i = 0; $i < $hrefs->length; $i++) {
        $href = $hrefs->item($i);
        $url = $href->getAttribute('href');

        //remove and set target attribute        
        $href->removeAttribute('target');
        $href->setAttribute("target", "_blank");

        $newURL=$url."/newurl";

        //remove and set href attribute        
        $href->removeAttribute('href');
        $href->setAttribute("href", $newURL);
}

// save html
$html=$dom->saveHTML();

echo $html;

?>

down

info at ensostudio dot ru ¶

6 months ago


Solution to render HTML 5 tags with attributes with/without value:
<?php
$dom = new DOMImplementation();
$doc = $dom->createDocument(null, 'html', $dom->createDocumentType('html'));

$tag = $doc->appendChild($doc->createElement('input'));
$tag->setAttribute('type', 'text');
$tag->setAttribute('disabled', '');

echo $doc->saveHTML($tag); // <input type="text" disabled="">

$doc->normalize(); // normalize attributes
echo $doc->saveHTML($tag); // <input type="text" disabled>
?>

down

address at gmail dot com ¶

13 years ago


If wanting to set an attribute of an element with unique id of "1"

<?php
$dom = new DomDocument();
$dom->load('test.xml');
$xp = new DomXPath($dom);
$res = $xp->query("//*[@id = '1']");
$res->item(0)->setAttribute('title','2');
$dom->save('test.xml');
?>

down

-2

lehal2@hotmail ¶

9 years ago


The use of Dom to first remove and then add the width and height to the first img tag from the text.I hope it help you to save your time
<?php
$html = '

            <img src="http://www.example.com/images/header.jpg" width="898" height="223" style="border-bottom:5px solid #cccccc;"/>
        <img src="http://www.example.com/images/header2.jpg" width="898" height="223" style="border-bottom:5px solid #cccccc;"/>
        ';

$doc = DOMDocument::loadHTML($html);
$c =0;
foreach($doc->getElementsByTagName('img') as $image){
    if ($c>0) continue;
    foreach(array('width', 'height') as $attribute_to_remove){
        echo $attribute_to_remove;
        if($image->hasAttribute($attribute_to_remove)){
            $image->removeAttribute($attribute_to_remove);

        }
        if($attribute_to_remove=='height'){
            if(!$image->hasAttribute($attribute_to_remove)){
                $image->setAttribute($attribute_to_remove,'220');

            }}
        if($attribute_to_remove=='width'){
      if(!$image->hasAttribute($attribute_to_remove)){
            $image->setAttribute($attribute_to_remove,'700');

        }}
        $c = $c+1;
    }
}
echo $doc->saveHTML();

down

-4

karvjorm at users.sourceforge.net ¶

15 years ago


$dom = new DomDocument('1.0','iso-8859-15');

$ht_ml = $dom->appendChild($dom->createElement('html'));
$ht_ml->setAttribute('xmlns','http://www.w3.org/1999/xhtml');
$ht_ml->setAttribute('xml:lang','fi');
$ht_ml->setAttribute('lang','fi');

Result:

<?xml version="1.0" encoding="iso-8859-15"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fi" lang="fi">

down

-7

Vasil Rangelov ¶

14 years ago


@karvjorm,
Using this method is not exactly a good practice. Infact, I think it may be a bug.
Names beginning with "xml" are reserved (for namespaces in this case).
setAttribute() should return false in this case I think, but I suppose it doesn't.

Still, the right way to do it is with createElementNS().
It lets you specify the namespace when creating the element node.

So the equivalent to yours ($html added to allow word wrapping) is:

$dom = new DomDocument('1.0','iso-8859-15');
$html = $dom->createElementNS('http://www.w3.org/1999/xhtml', 'html');
$ht_ml = $dom->appendChild($html);
$ht_ml->setAttribute('xml:lang','fi');
$ht_ml->setAttribute('lang','fi');

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官方地址：https://www.php.net/manual/en/domelement.setattribute.php

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DOMElement::setAttribute

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes 6 notes