https://www.php.net/manual/ja/domelement.hasattribute.php
PHP: DOMElement::hasAttribute - Manual
phpdomelementhasattributemanual
https://www.w3schools.com/jsref/met_element_hasattribute.asp
HTML DOM Element hasAttribute() Method
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
html domelementhasattributemethod
https://www.php.net/manual/pt_BR/domelement.hasattribute.php
PHP: DOMElement::hasAttribute - Manual
Verifica se o atributo existe
phpdomelementhasattributemanual