The server displays the error pages, not PHP. Its not that hard to customize, and you can have a script do it, but once the misconfiguration page is being show

The server displays the error pages, not PHP. Its not that hard to customize, and you can have a script do it, but once the misconfiguration page is being shown, your configuration is screwed up anyway. This kind of error usually results from your script not interfacing with the server correctly (like not sending the response code in the right format).