What are the differences between using $REMOTE_ADDR and $_SERVER["REMOTE_ADDR"] in PHP scripts?

Using $REMOTE_ADDR directly is not recommended as it is a global variable that may not always be set depending on the server configuration. It is better to use $_SERVER["REMOTE_ADDR"] as it accesses the remote IP address through the server-supplied environment variables. 

$remote_addr = $_SERVER["REMOTE_ADDR"];
echo "Remote IP Address: " . $remote_addr;

Keywords

$REMOTE_ADDR $_SERVER "REMOTE_ADDR" PHP scripts differences

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