PHP OO problem

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Revision as of 23:35, 29 July 2013 by Nad (talk | contribs) (Created page with "Take the following example class ''Foo'' which defines a static method called ''X'' that statically calls another of it's method's called ''Y'' using ''self::Y()'' as follows....")
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Take the following example class Foo which defines a static method called X that statically calls another of it's method's called Y using self::Y() as follows.

<php>

class Foo {

public static function X() { self::Y(); }

public static function Y() { echo( "This is Foo::Y" ); }

} </php>


Now lets say that Foo is part of a core library that we don't have commit access to and we want to make a modified version of the functionality via a sub-class of Foo called Bar which overrides the Y method as follows.

<php>

class Bar extends Foo {

public static function Y() { echo( "This is Bar::Y" ); }

} </php>


But the Y method is only ever called via the self::Y statement in the X method, so when we call Bar::X() it's actually Foo::Y that executes, because X only ever executes within the context of Foo since we haven't overridden the X method with a definition in the Bar class.