Description:
------------
First of all:
    phpinfo(); 
says "PHP Version 5.2.4".

   The problem is I get different results of as I think the same ideologically code.


Reproduce code:
---------------
1)
<?php
function handler(){
    print('hello');
}
$old_han = set_error_handler('handler');

try {
   $xslDom = DOMImplementation::createDocument();    
} catch (Exception $e) {
    echo "<pre>", $e, "</pre>";   
}
?>

2)
<?php
try {
   $xslDom = DOMImplementation::createDocument();    
} catch (Exception $e) {
    echo "<pre>", $e, "</pre>";   
}

function handler(){
    print('hello');
}
$old_han = set_error_handler('handler');
?>

Expected result:
----------------
The result expected to be the same. I mean no "hello" print!

Actual result:
--------------
1)
hello
2)
blank page