Question

I keep getting this error from my code and I have no idea what I am doing wrong, this happens on occasions and it seems to work when it wants to

error

 Call to a member function find() on a non-object in C:\xampp\htdocs\sites\P\Find.php on line 265

I’ve basically created a crawler which searches a webpage for an element on the webpage, sometimes this element may not be present on the page, and I check for this by using the if statement.

line 265 refers to

if($page->find('div#olpDivId span.price'))

code

   $page = file_get_html('http://www.amazon.co.uk/dp/0304362212');

   if($page->find('div#olpDivId span.price')){
        foreach($page->find('div#olpDivId span.price') as $p){
            $i[] = floatval($p->plaintext);                 
        }
    }

if the book does not exist the crawler goes to a blank “sorry product does not exist” page
Am I doing something wrong? any help would be appreciated

Answer 1

file_get_html can return false (if it was unable to fetch content from webpage), so you should check for it before using any method on $page

$page = file_get_html('http://www.amazon.co.uk/dp/0304362212');

if($page !== FALSE){
    foreach($page->find('div#olpDivId span.price') as $p){
        $i[] = floatval($p->plaintext);                 
    }
 }