PHP exception Handling-Set top-level exception handler

The Set_exception_handler () function sets a user-defined function to handle all uncaught exceptions.

Exception: ", $exception->getmessage ();} Set_exception_handler (' myexception '); throw new Exception (' uncaught exception occurred ');? >

The output of the above code should look like this:

Exception:uncaught Exception occurred

In the above code, there is no "catch" code block, but the top-level exception handler is triggered. You should use this function to catch all uncaught exceptions.

Rules for exceptions

• The code that requires exception handling should be placed inside a try code block to catch a potential exception.
• Each try or throw code block must have at least one corresponding catch code block.
• You can use multiple catch blocks to catch different kinds of exceptions.
• You can throw (re-thrown) exceptions again in a catch code block within a try code block.

In short: If an exception is thrown, it must be captured.

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