exception handling in php

<?php

/*
function md_require($file){
        if(file_exists($file)) {
            require_once($file);
        } else {
            throw(new Exception('File '.$file.' does not exist.'));
        }
    }

md_require("config.php");

echo "This is a test file";
*/

try {
    $error = 'Always throw this error';
    throw new Exception($error);

    // Code following an exception is not executed.
    echo 'Never executed';

} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

// Continue execution
echo 'Hello World';
?>