validate a localhost:xxxx link in php laravel [closed] - php

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i have the method:
public function getAppLink($app_path)
{
if( ! $this->isAppExists($app_path)) { return false; }
$content = $this->getContent();
// make sure that the link is available
$validate_link = \Validator::make(
['app_link' => $content->apps->$app_path->link],
['app_link' => 'active_url']
);
if($validate_link->fails())
{
$this->setAppStatus($app_path, 'stopped');
$this->setAppLink($app_path, 'invalid_link');
return '';
}
else {
$this->setAppStatus($app_path, 'started');
return $content->apps->$app_path->link;
}
}
i need to validate that localhost:xxxx link is active and can be accessed via the browser, before returning it.
somehow the laravel way of testing link is not working, am i doing this wrong, or i need to use a different approach?
note: xxxx is the port number

Answer 1

The Laravel active_url Validator is just a wrapper around the PHP checkdnsrr function. The purpose of this function is solely to check for DNS records, not to actually check if the server is responding.
Because you are on localhost, there are no DNS records so this check would not work.
If you want to check that a link can be accessed by the browser, you have to do that in JavaScript on the browser. Otherwise, you could have a case where http://localhost:1234 is accessible from the server but is not accessible from the browser because of the firewall or because the webserver is only listening on 127.0.0.1 and not on all IP addresses. While this will obviously work properly as long as you are doing all of your development on your local computer, it may cause you problems in production (depending, of course, on exactly what it is that you need this information for).
If you actually want to check whether the site is up, just do a CURL GET (or HEAD) request to the URL.
An easy way to use CURL in Laravel is with this composer package. The full documentation is too long to put here, but you can find it here.

Answer 2

i solved this problem by using fsockopen:
// ==================================================== isLinkValid()
//
// $link : the link you want to validate, ex: localhost:1234
//
// return true | false
//
private function isLinkValid($link)
{
if(strpos($link, ":") === false)
{
return false;
}
$arr_link = explode(":", $link);
$host = $arr_link[0];
$port = $arr_link[1];
$sock_open = #fsockopen($host, $port);
if(is_resource($sock_open))
{
fclose($sock_open);
return true;
}
return false;
}