A _php instance of the use of Set_exception_handler function in thinkphp

This article illustrates the use of the Set_exception_handler function in thinkphp. Share to everyone for your reference. The specific methods are as follows:

Function:

Copy Code code as follows:

String Set_exception_handler (callback $exception _handler)

Definition and Usage:
The Set_exception_handler () function sets the user-defined exception-handling function.
This function is used to create the user's own exception handling methods for the Run-time period.
The function returns the old exception handler, or null if it fails.

Grammar:
Set_exception_handler (exception_function)

Parameters	Description
Error_function	Necessary. A function that is called when an exception that is not caught is specified. The function must be defined before calling the Set_exception_handler () function. This exception handler requires a parameter, the exception object that is thrown.

Tips and Comments:

tip : After this exception handler is invoked, the script stops executing.

In the same time to see the TP code found this function, I do not understand, I have not cared about these things before? (Wringing ... ）
Continue to see how TP is implemented, uh, why must use TP, hmm. Well, I'll take the example of the handbook in a moment.

Copy Code code as follows:

Public Function appexception ($e)
{
Halt ($e->__tostring ());
}
Set_exception_handler (Array (& $this, "Appexception"));

Oh, this simple? Because I did not give the implementation of halt this method, this is enough.
And look at the examples in the manual,

Copy Code code as follows:

function Exception_handler ($exception) {
echo "uncaught exception:", $exception->getmessage (), "n";
}
Set_exception_handler (' Exception_handler ');
throw new Exception (' uncaught Exception ');
echo "Not Executedn";

In fact, Set_exception_handler is set to call which custom function when your program needs to throw an exception.
It's that simple.

Precautions:
Set_exception_handler ("MyException") can accept not only functions but also methods of the class (both exposed static methods and exposed non-static methods), but it needs to be passed as an array, the first value of the array is "class name" and the second parameter is "Method Name"

I hope this article will be helpful to everyone's thinkphp framework program design.