How can server migration affect PHP scripts and cause unexpected errors like the one mentioned in the forum thread?

Server migration can affect PHP scripts by changing server configurations, PHP versions, or file paths, leading to unexpected errors. In the mentioned forum thread, the issue was caused by a change in the PHP version, which resulted in a deprecated function being used. To solve this issue, update the deprecated function with a suitable alternative that is compatible with the new PHP version.

// Before migration
$deprecated_result = mysql_query($query);

// After migration
$updated_result = mysqli_query($connection, $query);