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11 years ago
For those that haven't done exception chaining. Here's an example. 

This allows you to add the previous exception to the next one and give yourself detailed information in the end as to what happened. This is useful in larger applications.

<?php
function theDatabaseObj(){
     if( database_object ){
         return database_object; 
     }
     else{
         throw new DatabaseException("Could not connect to the database");
     }
}

function updateProfile( $userInfo ){
     try{
         $db = theDatabaseObj();
         $db->updateProfile();
     }
     catch( DatabaseException $e ){
         $message = "The user :" . $userInfo->username . " could not update his profile information";
         /* notice the '$e'. I'm adding the previous exception  to this exception. I can later get a detailed view of 
          where the problem began. Lastly, the number '12' is  an exception code. I can use this for categorizing my 
         exceptions or don't use it at all. */ 
         throw new MemberSettingsException($message,12,$e);
     }
}

try{
     updateProfile( $userInfo );
}
catch( MemberSettingsException $e ){
     // this will give all information we have collected above. 
     echo $e->getTraceAsString();
}
?>
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