What potential issues can arise from using outdated variables like $REMOTE_ADDR in PHP scripts?

Using outdated variables like $REMOTE_ADDR in PHP scripts can lead to security vulnerabilities as it can be easily spoofed by attackers. It is recommended to use $_SERVER['REMOTE_ADDR'] instead to get the client's IP address securely. 

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

Keywords

$REMOTE_ADDR outdated variables security vulnerabilities deprecated functions PHP scripts

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