Question

From this Simple Dom Site

if(isset($html->'div#sidebar')) 
{
    $sidebarFile = 'D:\xampp\htdocs\final\wordpress\sidebar.php';
    $openSidebarFile = fopen($sidebarFile,'a');
    foreach($html->find('div#sidebar')) as $e)
    {
        $html ->find('div[id=sidebar]', 0) -> innertext;
        $inputSidebar = $e->outertext;
        fwrite($openSidebarFile, "\n" .inputSidebar "\n");
    }
}

From the documentation:
it says:

// Determine whether a attribute exist? 
if(isset($e->href)) 
        echo 'href exist!';

Answer 1

There are a few issues here I’ll just correct them inline:

if($html->find('div#sidebar')) 
{
    $sidebarFile = 'D:\xampp\htdocs\final\wordpress\sidebar.php';
    $openSidebarFile = fopen($sidebarFile,'a');
    foreach($html->find('div#sidebar') as $e)
    {
        $html ->find('div[id=sidebar]', 0) -> innertext;
        $inputSidebar = $e->outertext;
        fwrite($openSidebarFile, "\n" .inputSidebar "\n");
    }
} 

Now, what was changed? The first if, and the foreach. The if used the wrong function, and the wrong check for empty. The foreach had mismatched () braces.