How can dynamic IP addresses affect the functionality of a PHP script that relies on IP address verification?

Dynamic IP addresses can affect the functionality of a PHP script that relies on IP address verification because the user's IP address can change frequently. To solve this issue, you can use a combination of session variables and user agent strings to create a more reliable form of user identification. 

// Start the session
session_start();

// Verify the user's IP address using the user agent string
if($_SESSION['user_agent'] !== $_SERVER['HTTP_USER_AGENT']) {
    die('Access denied. Invalid user agent.');
}

// Store the user agent string in the session
$_SESSION['user_agent'] = $_SERVER['HTTP_USER_AGENT'];

Keywords

Dynamic IP addresses PHP script IP address verification functionality impact

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