In what ways can DNS problems impact PHP scripts that rely on external resources like URLs in Linux environments?

DNS problems can impact PHP scripts in Linux environments by causing delays or failures in resolving external URLs. This can lead to timeouts, errors, or incorrect data being fetched from external resources. To solve this issue, you can set up a custom DNS resolver in your PHP script using the `CURLOPT_RESOLVE` option in cURL to specify the IP address of the domain you are trying to access. 

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com');
curl_setopt($ch, CURLOPT_RESOLVE, array('example.com:80:192.0.2.1'));
$result = curl_exec($ch);
curl_close($ch);

Keywords

DNS resolution PHP cURL Linux environment URL parsing Network errors

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