PHP exception handling—set top-level exception handler

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

Exception rules

• Code that requires exception handling should be placed within a try code block to catch potential exceptions.
• Every try or throw block must have at least one corresponding catch block.
• Use multiple catch blocks to catch different kinds of exceptions.
• Exceptions can be re-thrown in a catch block within a try block.

In short: if an exception is thrown, you must catch it.

The above introduces PHP exception handling - setting up the top-level exception handler, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.