使用get_meta_tags（）和get_headers（）进行异常处理？

Question

In PHP, I am using get_meta_tags() and get_headers(), however, when there is a 404, those two functions throw a warning. Is there any way for me to catch it? Thanks!

Answer 1

get_headers does not throw a Warning/Error on 404, but get_meta_tags does.

So you can check the header response and do something, when it's not OK:

$url = 'http://www.example.com/';

$headers = array();
$metatags = array();

$validhost = filter_var(gethostbyname(parse_url($url,PHP_URL_HOST)), FILTER_VALIDATE_IP);
if($validhost){
    // get headers only when Domain is valid
    $headers = get_headers($url, 1);

    if(substr($headers[0], 9, 3) == '200'){
        // read Metatags only when Statuscode OK
        $metatags = get_meta_tags($url);
    }
}