PHP Simple HTML DOM, Notice: Trying to get property of non-object

问题

I am getting Notice: Trying to get property of non-object at:

$var = trim($article->find('span[id$=qty]', 0)->innertext);

$article is a simple_html_dom() object.

回答1:

Maybe span[id$=qty] evaluates to null; means: no node was found.

来源：https://stackoverflow.com/questions/6003991/php-simple-html-dom-notice-trying-to-get-property-of-non-object