Exception::__construct

(PHP 5, PHP 7, PHP 8)

Exception::__construct — Construit l'exception

Description

public Exception::__construct(string $message = "", int $code = 0, ?Throwable $previous = null)

Construit l'exception.

Liste de paramètres

message: Le message de l'exception à lancer.
code: Le code de l'exception.
previous: L'exception précédente, utilisée pour le chaînage d'exception.

Note: L'appel du constructeur de l'exception de classe à partir d'une sous-classe ignore les arguments par défaut, si les propriétés $code et $message sont déjà définies.

Notes

Note:
Le message n'est PAS binary safe.

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User Contributed Notes 2 notes

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talksonweb at gmail dot com ¶

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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mattsch at gmail dot com ¶

11 years ago

Be aware that while $previous is quite useful in providing exception chaining and better traceability, none of the internal php exceptions (e.g. PDOException, ReflectionException, etc) are called internally within php with $previous in mind.  

So if your code throws an exception, recovers from it, then catches one of these internal php exceptions, recovers from it and throws another exception, you will not know the first exception that was thrown when calling getPrevious.

See: https://bugs.php.net/bug.php?id=63873

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