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    <p>My feeling is that you are over using exceptions. As referenced by the name, an expection should only be thrown under <strong>Exceptional Circumstances</strong>.</p> <p>Exceptions should not be used to control the flow of your application. Users entering bad data or not entering a correct username and password would be considered part of the normal flow of your application, not something exceptional.</p> <p>You should only throw exceptions in exceptional circumstances that could potentially render the whole or part of the application unusable, for example, not being able to connect to the database.</p> <p>This way, you will not end up with so many exceptions in the system that requires catching and perhaps rethrowing.</p> <p>It is a good idea to have different exceptions, for example, I use the <a href="http://www.redbeanphp.com/">RedBean ORM</a> to talk with my database, and it uses these Exceptions:</p> <ul> <li>RedBean_Exception_Security (when a security exception has occurred).</li> <li>RedBean_Exception_SQL (when bad sql syntax or some other issue has occurred).</li> </ul> <p>Being too specific about the exception can lead to a lot of confusion. For example, if I have an exception for <code>missing sql column</code>, <code>bad syntax</code>, <code>missing value</code>, etc, it can become quite unmanagable. But if I have an <code>SQL_Exception</code>, and use that exception for all of the above, then it is much more neater and simplier to manage.</p> <p>As for performance, having to load a lot of classes (I am assuming they are in external files), can be taxing to the application. This can be partially aleviated by using <a href="http://php.net/manual/en/book.apc.php">APC</a>, to cache interpreted PHP code in memory. But this is hard to tell without any profiling.</p>
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    1. POHow to name exceptions (PHP)?
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    1. COWell, one thing I am struggling is, why even need to create different exceptions instead of just throwing a simple `Exception`. I know that, it makes sense to categorize exceptions, but if all uncaught exceptions can terminate the process, then it does not matter by what name you catch them, since every script stoping program has to be caught with `exception` later..
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    2. COThe benefit of categorizing them is that if you want to log them for later analysis, it makes things easier. For example, you can use something like `fluentd` to intercept and log in a global exception handler before terminating. If the exceptions are categorized, it is easy to store that with fluentd and analyse it with something like kabana. Then you can ask questions like `what are the most common database connection failures and why?`, `When do we often have problems sending email using our transactional email provider's api?`
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    3. COSorry, I meant to say `kibana` the log analysing software and not `kabana` the sausage. Unfortunately, my comment is no longer editable, so I hope this comment will help.
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