Question

my sample code is here

include 'simple_html_dom.php';
function get_all_links($url){
    global $host;
    $html = new simple_html_dom();
    $html->load(file_get_contents($url));

    foreach($html->find('a') as $a){
        $host1 = parse_url($a->href);
        $host = parse_url($url);
            if($host1['host'] == $host['host']){
                    $data[] = $a->href;
            }
    }
    return $data;

}
$links = get_all_links("http://www.example.com/");

foreach($links as $link){
   echo $link."<br />";
}

When I try this code, I got this error: Notice: Undefined index: host in… What’s wrong in my code? Please suggest me some helping code, Thanks in Advance.

Answer 1

You need to check if the arrays contain entries for 'host' using isset before assuming they exist:

if (isset($host1['host']) && isset($host['host']) 
        && $host1['host'] == $host['host']) {

Or you can use @ to suppress warnings from the check.

if (@$host1['host'] == @$host['host']) {

However, you’ll need to double-check that the latter works as you desire when both are missing.

Update: As the others pointed out there is also array_key_exists. It will handle null array values whereas isset returns false for null values.