Why parent::construct not called?

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QAIX > PHP web-programming > Why parent::construct not called? 23 March 2008 01:03:23

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Why parent::construct not called?
Michel 'Ziobudda' Morelli 23 March 2008 01:03:23
	Hi, why if I have class B extends A { } the only way to call in automatic the A::__construct() is to not write the B::__construct() ? Ok, this is the design of PHP. But why ? tnx -- michel 'ziobudda' morelli <michel@ziobudda.net> -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Marcus BГ¶rger 23 February 2003 19:32:49 [ permanent link ]
	At 16:46 23.02.2003, michel 'ziobudda' morelli wrote:>Hi, why if I have> class B extends A {>}> the only way to call in automatic the A::__construct() is to not write>the B::__construct() ?> Ok, this is the design of PHP. But why ? You can do the following: class base { function __construct() { echo "base::__construct()\n"; } function __destruct() { echo "base::__destruct()\n"; } } class derived extends base { function __construct() { parent::__construct(); echo "derived::__construct()\n"; } function __destruct() { parent::__destruct(); echo "derived::__destruct()\n"; } } See: http://marcus-boerger.de/php/ext/ze2/ctor_dtor_inheritance.phpt.txt regards marcus -- ---------------------------------------------------------------------- Marcus BГ¶rger - Looking for all sorts of freelance work - just ask... Did i help you? Consider a gift: http://www.amazon.de/exec/obidos/wishlist/ho722v0rg1u0 ---------------------------------------------------------------------- -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Michel 'Ziobudda' Morelli 23 February 2003 20:04:20 [ permanent link ]
	Il dom, 2003-02-23 alle 17:32, Marcus BГ¶rger ha scritto:> You can do the following:> class base {> function __construct() {> echo "base::__construct()\n";> } [...] I know know. What I want to understand is why the base::__construct() is called (in automatic) only when derived::__constuct() is missing. I think that or the base::__construct() is always in automatic called or it is always never called (in automatic). bye -- michel 'ziobudda' morelli <michel@ziobudda.net> -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Marcus BГ¶rger 23 February 2003 20:07:17 [ permanent link ]
	At 18:02 23.02.2003, michel 'ziobudda' morelli wrote:>Il dom, 2003-02-23 alle 17:32, Marcus BГ¶rger ha scritto:> > You can do the following:> > class derived extends base {> > function __construct() {> > parent::__construct();> > echo "derived::__construct()\n";> > }> > I know know.> What I want to know is why the base::__construct() is called (in>automatic) only when derived::__constuct() is missing.> I think that or the base::__construct() is always in automatic called or>it is never called (always in automatic). In ZE2 each class has a constructor. That constructor can be overwritten by writing a method named "__construct". So far so good. Unlike other languages, C++ for one, PHP does not call any inherited constructors automatically, C++ calls the default constructor if not set explicitly. But PHP inherits the constructor if it is not redeclared/overwritten. Therfor if the base has a constructor and the derived has not the inherited (the one from base) is called. regards marcus -- ---------------------------------------------------------------------- Marcus BГ¶rger - Looking for all sorts of freelance work - just ask... Did i help you? Consider a gift: http://www.amazon.de/exec/obidos/wishlist/ho722v0rg1u0 ---------------------------------------------------------------------- -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Timm Friebe 23 February 2003 20:29:05 [ permanent link ]
	On Sun, 2003-02-23 at 18:04, michel 'ziobudda' morelli wrote:> Il dom, 2003-02-23 alle 17:32, Marcus BГ¶rger ha scritto:> > You can do the following:> > class base {> > function __construct() {> > echo "base::__construct()\n";> > }> [...]> I know know.> What I want to understand is why the base::__construct() is called (in> automatic) only when derived::__constuct() is missing. Because (from a user's point of view) the constructor is inherited just like any other function. I think that or the base::__construct() is always in automatic called or> it is always never called (in automatic). Well, because there might be situations in which I'd like to call the parent's constructor before my code in __construct, sometimes after it and in some situations, not call it at all. - Timm -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Michel 'Ziobudda' Morelli 23 February 2003 20:31:30 [ permanent link ]
	Il dom, 2003-02-23 alle 18:07, Marcus BГ¶rger ha scritto:> In ZE2 each class has a constructor. That constructor can be overwritten> by writing a method named "__construct". So far so good. Ok... This is the design.. tnx. -- michel 'ziobudda' morelli <michel@ziobudda.net> -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Marcus Brger 23 February 2003 20:34:24 [ permanent link ]
	At 18:29 23.02.2003, Timm Friebe wrote:>Well, because there might be situations in which I'd like to call the>parent's constructor before my code in __construct, sometimes after it>and in some situations, not call it at all. I hope you will never avoid initialising the base class or just call the base constructor after anything else is done in the dericed constructor. The problem is that when you so the behavior of the base class members (functions and properties) is not predictable. marcus -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
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Guest 23 March 2008 01:03:23 [ permanent link ]
	really stupid design decision of php team
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QAIX > PHP web-programming > Why parent::construct not called? 23 March 2008 01:03:23

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Why parent::construct not called?

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