Define handler for call_user_func in class

Question

This is very basic question, I have this class which says i can define my own handler which will alter the callName() function in the example below :

class MyClass
{
 protected static $callHandler;

 public static function callName($name){
        if (static::$callHandler) {
            return call_user_func(static::$callHandler, $name);
        }
     print $name;
  } 
}

I know i can do this : $class = new MyClass(); $class->callName("Jonny");

But how do I define my own $callhandler in call_user_func and alter the outcome?

`MyClass::callName()` is a [static method](http://php.net/manual/en/language.oop5.static.php). You should call it as `MyClass::callName("Jonny")`. — axiac, Aug 28 '17 at 08:15
Thanks for the answer @axiac, tell me how do i define $callHandler — San, Aug 28 '17 at 08:23
Any function that receives one argument can be used as `$callHandler`. You have to add a (static) method to your class to set it, though. — axiac, Aug 28 '17 at 08:24
Are you writing this class, or are you asking us how to alter `$callHandler` in this existing class…? — deceze, Aug 28 '17 at 08:25

score 0 · Answer 1 · answered Aug 28 '17 at 08:23

These are the ways that come to my mind, you should choose the most appropriate one:

Check the rest of the methods of the class if some kind of setter, initializer or magic setter method exists and use it.
Extend MyClass and set $callHandler there.
Extend MyClass and create some static initialization function, which you'll call afterwards to set the value.
Use Reflection.

You can check these SO questions, they're similar: How to initialize static variables, Dynamically populating a static variable in PHP.

Define handler for call_user_func in class

1 Answers1