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

Example #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

User Contributed Notes

lehal2@hotmail 06-Jun-2013 09:44


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();

Rakesh Verma - rakeshnsony at gmail dot com 10-Nov-2010 11:27


<?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;



?>

address at gmail dot com 03-Jul-2008 07:25


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');

?>

Vasil Rangelov 31-Jul-2007 04:44


@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');

karvjorm at users.sourceforge.net 02-Mar-2007 03:05


$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">