What potential security risks are associated with using $_SERVER['REMOTE_ADDR'] to retrieve IP addresses in PHP?

Using $_SERVER['REMOTE_ADDR'] to retrieve IP addresses in PHP can be risky because it relies on user input, which can be manipulated or spoofed. This can lead to security vulnerabilities such as IP address spoofing, which can be used for malicious purposes. To mitigate this risk, it is recommended to use a more secure method such as filtering and validating the input before using it in your application. 

$ip = filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP);
if($ip){
    // IP address is valid, proceed with using it
} else {
    // Handle invalid IP address
}

Keywords

$_SERVER REMOTE_ADDR security risks IP addresses PHP

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