What are some common pitfalls to avoid when implementing a whois domain availability check in PHP?

One common pitfall to avoid when implementing a whois domain availability check in PHP is relying on unreliable third-party APIs or services that may have limitations or downtime. To avoid this, it's recommended to directly query the whois server for the domain availability information. Additionally, make sure to handle errors and exceptions properly to prevent any disruptions in the functionality of the script. 

function isDomainAvailable($domain) {
    $whois_server = 'whois.verisign-grs.com';
    $fp = fsockopen($whois_server, 43);
    if (!$fp) {
        return false;
    }
    
    fputs($fp, $domain . "\r\n");
    $response = '';
    while (!feof($fp)) {
        $response .= fgets($fp, 128);
    }
    fclose($fp);
    
    if (strpos($response, 'No match for') !== false) {
        return true;
    } else {
        return false;
    }
}

$domain = 'example.com';
if (isDomainAvailable($domain)) {
    echo $domain . ' is available';
} else {
    echo $domain . ' is not available';
}

Keywords

whois domain availability check PHP error handling exception handling

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