How can I redirect to the error page when somebody encounter an error?

Below is the solution for asp.
<%
on error resume next
.
.
if err.number > 0 then response.redirect "xxx.asp"
%>

Can PHP do that?

Or,I must setup on apache?

Im pretty sure this forum is for PHP not ASP

But anyway

the way PHP does it is.. header("LOCATION: blah.php");

if you wanna see if theres an error.. im not exactly sure on how to see if there is.. But you could try functions..
or OOP

$this->con="asdasd";
if(!$this->con)
{
$this->error="Message for error maybe LINE FILE etc";
$this->error();
}

thats not very good but yea

then a function called

function error()
{
return $this->error;
}

something like that.. would do..

There are also the error reporting and handling functions, variables, constants, and configuration settings listed here,