©
This document uses PHP Chinese website manual Release
(PHP 5 >= 5.1.0)
Exception::__construct — 异常构造函数
$message
= ""
[, int $code
= 0
[, Exception $previous
= NULL
]]] )异常构造函数。
message
抛出的异常消息内容。
code
异常代码。
previous
异常链中的前一个异常。
版本 | 说明 |
---|---|
5.3.0 |
增加previous 参数。
|
Note:
The
message
is NOT binary safe.
[#1] talksonweb at gmail dot com [2013-07-03 21:43:22]
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 :" . $userInfo->username . " could not update his profile information";
throw new MemberSettingsException($message,12,$e);
}
}
try{
updateProfile( $userInfo );
}
catch( MemberSettingsException $e ){
// this will give all information we have collected above.
echo $e->getTraceAsString();
}
?>
[#2] mattsch at gmail dot com [2012-12-31 15:08:12]
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
[#3] mario dot mueller at twt dot de [2009-01-30 02:21:47]
This would be nice for handling ZendFramework Exceptions to your own framwork or CMS Exceptions:
<?php
try
{
$oZFResponse = $oZFHttpClient->request();
}
catch(Zend_Http_Exception $exZFHttpEx)
{
throw new Runtime_{$oZFHttpEx->getCode()}_Exception('some ErrorMailing Message', 500, $oZFHttpEx);
}
?>
Regards,
Mario