What is the difference between $_SERVER['REMOTE_ADDR'] and $REMOTE_ADDR in PHP?

The difference between $_SERVER['REMOTE_ADDR'] and $REMOTE_ADDR in PHP is that $_SERVER['REMOTE_ADDR'] is a superglobal array that contains server and execution environment information, including the client's IP address, while $REMOTE_ADDR is a regular variable that does not hold the client's IP address. To access the client's IP address in PHP, you should use $_SERVER['REMOTE_ADDR']. 

// Accessing the client's IP address using $_SERVER['REMOTE_ADDR']
$client_ip = $_SERVER['REMOTE_ADDR'];
echo "Client's IP address: " . $client_ip;

Keywords

$_SERVER REMOTE_ADDR PHP superglobal variable

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