Set_exception_handler function usage in ThinkPHP _ php instance

This article mainly introduces the usage of set_exception_handler function in ThinkPHP, analyzes the official descriptions and examples of set_exception_handler function usage, and describes the application instances in ThinkPHP, for more information about how to use the set_exception_handler function in ThinkPHP, see the example in this article. Share it with you for your reference. The specific method is as follows:

Function:

The code is as follows:

String set_exception_handler (callback $ exception_handler)

Definition and usage:
The set_exception_handler () function sets the custom exception handling function.
This function is used to create your own exception handling methods during runtime.
This function returns the old exception handler. if it fails, null is returned.

Syntax:
Set_exception_handler (exception_function)

Parameters	Description
Error_function	Required. Specifies the function called when an uncaptured exception occurs. This function must be defined before the set_exception_handler () function is called. This exception handling function requires a parameter, that is, the thrown exception object.

Tips and notes:

Prompt: After the exception handler is called, the script stops running.

I also find this function when I look at the TP code, so I can't understand it. why have I never cared about these things before? (Beat your chest at ing ...)
Let's take a look at how TP is implemented. er, why must we use TP. Well, I will move the manual examples later.

The code is as follows:

Public function appException ($ e)
{
Halt ($ e->__ toString ());
}
Set_exception_handler (array (& $ this, "appException "));

Oh, is this simple? Because I didn't provide the implementation of the halt method, this is enough.
Let's look at the example in the manual,

The code is 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 sets the custom function to be called when your program needs to throw an exception.
That's simple.

Note:
Set_exception_handler ("myException") not only accepts functions, but also accepts class methods (public static methods and public non-static methods are acceptable), but must be transmitted in arrays, the first value of the array is "class name", and the second parameter is "method name"

I hope this article will help you with ThinkPHP framework programming.