Weird error using PHP Simple HTML DOM parser

Question

I am using this library (PHP Simple HTML DOM parser) to parse a link, here\'s the code:

function getSemanticRelevantKeywords($keyword){
    $results = array(         


        

Answer 1

Before file_get_html/load_file method, you should first check if URL exists or not.

If the URL exists, you pass one step.
(Some servers, service a 404 page a valid HTML page. which has propriate HTML page structure like body, head, etc. But it has only text "This page couldn'!t find. 404 error bla bla..)

If URL is 200-OK, then you should check whether fetched thing is object and whether nodes are set.

That's the code i used in my pages.

function url_exists($url){
    if ((strpos($url, "http")) === false) $url = "http://" . $url;
    $headers = @get_headers($url);
    // print_r($headers);
    if (is_array($headers)){
        if(strpos($headers[0], '404 Not Found'))
            return false;
        else
            return true;    
    }         
    else
        return false;
}

$pageAddress='http://www.google.com';
if ( url_exists($pageAddress) ) {
    $htmlPage->load_file( $pageAddress );
} else {
    echo 'url doesn t exist, i stop';
    return;
}

if( $htmlPage && is_object($htmlPage) && isset($htmlPage->nodes) )
{
    // do your work here...
} else {
    echo 'fetched page is not ok, i stop';
    return;
}