>
________________________________
> From: Lamp Lists <[email protected]>
> To: [email protected]
> Sent: Monday, April 13, 2009 9:29:16 AM
> Subject: [PHP] try - catch is not so clear to me...
>
> hi to all!
>
> actually, the statement in the Subject line is not 100% correct. I understand
> the purpose and how it works (at least I think I understand :-)) but to me
> it's so complicated way?
>
> let's take a look in example from php.net(http://us3.php.net/try)
>
>
> <?php
> function inverse($x) {
> if (!$x) {
> throw new Exception('Division by zero.');
> }
> else return 1/$x;
> }
>
> try {
> echo inverse(5) . "\n";
> echo inverse(0) . "\n";
> } catch (Exception $e) {
> echo 'Caught exception: ', $e->getMessage(), "\n";
> }
>
> // Continue execution
> echo 'Hello World';
> ?>
> I would do the same thing, I think, less complicated:
>
> <?php
> function inverse($x)
> {
> if (!$x) {
> echo 'Division by zero';
> }
> else return 1/$x;
>
> }
>
> echo inverse(5);
> echo inverse(0);
>
> // Continue execution
> echo 'Hello world';
> ?>
>
> I know this is "too simple, maybe not the best example", but can somebody
> please explain "the purpose" of try/catch?
>
> Thanks.
>
> -LL
another example from php.net
<?php
try
{
$connection = mysql_connect(...);
if ($connection === false)
{
throw new Exception('Cannot connect do mysql');
}
/* ... do whatever you need with database, that may mail and throw
exceptions too ... */
mysql_close($connection);
}
catch (Exception $e)
{
/* ... add logging stuff there if you need ... */
echo "This page cannot be displayed";
}
?>
compare to:
<?php
$connection = mysql_connect(...) or die('Cannot connect do mysql'.
mysql_error());
?>
-LL
