How can the PHP version of a website impact the functionality of the admin login page?

The PHP version of a website can impact the functionality of the admin login page if the code uses deprecated functions or features that are no longer supported in the newer PHP versions. To solve this issue, update the PHP code to use current functions and syntax that are compatible with the PHP version running on the server.

// Example of updating code to use current PHP functions
// Old code using deprecated function mysql_connect
$connection = mysql_connect($host, $username, $password);

// Updated code using mysqli_connect
$connection = mysqli_connect($host, $username, $password);