Introduction to phpcall_user_func

Introduction to phpcall_user_func mixed call_user_func (callback $ function [, mixed $ parameter [, mixed $...])

A php function is passed using a function name string. Any built-in or user-defined functions can be passed, except for the language structures such as array (), echo (), empty (), eval (), exit (), isset (), list (), print (), and unset ().

The method of an object is transmitted as an array. the subscript 0 of the array indicates the object name, and subscript 1 indicates the method name.

For a static class that is not instantiated as an object, pass its method and replace the object name specified by the array 0 subscript with the name of this class.

In addition to common user-defined functions, you can also use create_function () to create an anonymous callback function (callback ).