Is it common for the IP address of the client to be the same as the server's IP address in PHP development?

It is not common for the client's IP address to be the same as the server's IP address in PHP development. The client's IP address is typically obtained through the $_SERVER['REMOTE_ADDR'] variable, while the server's IP address can be obtained through the $_SERVER['SERVER_ADDR'] variable. If you are encountering a situation where the client's IP address appears to be the same as the server's IP address, it could be due to network configurations or proxy servers.

// Get the client's IP address
$client_ip = $_SERVER['REMOTE_ADDR'];

// Get the server's IP address
$server_ip = $_SERVER['SERVER_ADDR'];

echo "Client's IP address: " . $client_ip . "<br>";
echo "Server's IP address: " . $server_ip;