overridding

[xiaodao]

Hi

We know in JAVA, overridding is simple, how to do that in PHP? i searched online, only found examples on child class inherit parent then override, any possibility to do overridding in the same class? please give example, thank you

[bdl]

The PHP manual has an extensive section on classes and objects.

[xiaodao]

already read, but i got this

3) Sadly, overriding methods is only possible with the Zend II engine via Inheritance or Polymorphism, ( and __construct() can only be defined within a class). If you want to override a method in the same class, my suggestion is to provide the method signature with a $flag = null variable, which you call a SWITCH on to pick what the data should do

which i do not understand

[bdl]

So you can see there are limitations (at least in this version).

my suggestion is to provide the method signature with a $flag = null variable, which you call a SWITCH on to pick what the data should do

which i do not understand

Ok, this is very simple. Here's an example (UNTESTED):

PHP Code:

class SomeClass
{
    function some_method( $flag= null ) {
        if ( is_null($flag) ) {
          return 'default value';
        } else {
            switch($flag) {
                case 'foo':
                  return 'foo passed';
                case 'bar':
                  return 'bar passed';
                default:
                  return "args: 'foo' | 'bar'";
            }
        }
    }

} 


The method's signature has an argument with a default value, null. If you decide to call it with no arg, e.g. $obj->some_method(), then the default action is taken. If you pass an arg, e.g. $obj->some_method('foo'), then the switch statement triggers the appropriate action.

I'm sure there are examples using func_get_args() as well.

[xiaodao]

....thanks