catch Exception from __autoload

check this workaround :

<?php

function __autoload($name){
if (@!fopen($name.".php5","r")){
   eval("class $name { function __construct(){throw new Exception('$name is not found');}}");
}
else {
   require_once($name.".php5");
   echo "\n".$name." loaded";
}
}

try{
$n = new NonExistantClass();
}catch(Exception $e){
echo $e->getMessage();
}

try{
$a = "echo hello";
$n = new $a();
$n = new test();

}catch(Exception $e){
echo $e->getMessage();
}

?>

Do not forget to echo ' <?php class test {} ?>' > test.php5 (this will create basic class test inside test.php5.