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How does the type parameter in the checkdnsrr function affect the DNS lookup process in PHP?

The type parameter in the checkdnsrr function specifies the type of DNS record to look up, such as A, MX, NS, etc. This parameter affects the DNS lookup process by filtering the results to only include records of the specified type. If the type parameter is not provided, the function will return all types of DNS records for the given hostname. To use the checkdnsrr function with a specific type parameter in PHP, you can simply pass the desired type as the second argument in the function call.

php 
$hostname = 'example.com';
$type = 'MX';

if (checkdnsrr($hostname, $type)) {
    echo "DNS record of type $type found for $hostname";
} else {
    echo "No DNS record of type $type found for $hostname";
}

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