Introduction to PHP Call_user_func

Mixed Call_user_func (callback $function [, Mixed $parameter [, mixed $ ...])

A PHP function is passed with a function name string. Any built-in or user-defined functions can be passed in addition to the language structure such as array (), Echo (), Empty (), eval (), exit (), Isset (), list (), print (), and unset ().

An object's methods are passed as an array, the array's subscript 0 indicates the object name, and subscript 1 indicates the method name.

For static classes that are not instantiated as objects, to pass their methods, replace the object name indicated by the array 0 subscript with the name of the class.

In addition to normal user-defined functions, you can use Create_function () to create an anonymous callback function (callback).

　　

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