try/catch doesn't work in PHP

Why am I getting this error?

Warning: file_get_contents(http://www.example.com) [function.file-get-contents]: failed to open stream: HTTP request failed! in C:\xampp\htdocs\test.php on line 22

Fatal error: Maximum execution time of 30 seconds exceeded in C:\xampp\htdocs\test.php on line 22

Here is the code:

 try {
    $sgs = file_get_contents("http://www.example.com");
 }
 catch (Exception $e) {
    echo '123';
 }
 echo '467';

Aren't try\catch supposed to continue the excecution of the code? Or maybe there is some different way to do it?