(PHP 5, PHP 7)
DOMElement::setAttribute — Adds new attribute
public DOMElement::setAttribute ( string $name , string $value ) : DOMAttr
Sets an attribute with name name to the given value. If the attribute does not exist, it will be created.
name
The name of the attribute.
value
The value of the attribute.
The new DOMAttr or false if an error occurred.
DOM_NO_MODIFICATION_ALLOWED_ERR
Raised if the node is readonly.
Example #1 Setting an attribute
<?php
$doc = new DOMDocument("1.0");
$node = $doc->createElement("para");
$newnode = $doc->appendChild($node);
$newnode->setAttribute("align", "left");
?>
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https://www.php.net/manual/en/domelement.setattribute.php