How can server changes or updates impact the functionality of a PHP script like a guestbook server?

Server changes or updates can impact the functionality of a PHP script like a guestbook server if the server environment no longer supports certain functions or features that the script relies on. To solve this issue, you can update the PHP script to use alternative functions or features that are supported by the new server environment. 

// Check if a function is available before using it
if (function_exists('mysql_connect')) {
    // Use mysql_connect function
} else {
    // Use mysqli_connect function
}

Keywords

server changes updates PHP script guestbook server functionality

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