What is the function in PHP that can be used to retrieve a user's DNS name?

To retrieve a user's DNS name in PHP, you can use the gethostbyaddr() function. This function takes an IP address as input and returns the corresponding DNS name. This can be useful for identifying the host associated with a particular IP address. 

$ip = $_SERVER['REMOTE_ADDR'];
$dns_name = gethostbyaddr($ip);

echo "User's DNS name: " . $dns_name;

Keywords

PHP function retrieve user's DNS name gethostbyaddr

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