ID: 22253
Updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Closed
+Status: Open
-Bug Type: Scripting Engine problem
+Bug Type: Documentation problem
Operating System: win2k
PHP Version: 4.3.2-dev
Assigned To: zeev
New Comment:
Reopening as a doc problem, so doc guys will get this to fix...
Previous Comments:
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[2003-02-24 02:53:24] [EMAIL PROTECTED]
This behavior will not be changed in the context of PHP 4.x, but will
be fixed in PHP 5.0 (Zend Engine 2)
------------------------------------------------------------------------
[2003-02-23 17:14:47] [EMAIL PROTECTED]
Okay, now I got it. :)
The rule for PHP 4 should be:
"If class extending a base class hasn't got a constructor of it's own,
then the constructor of the base class is called."
Your example lacked the constructor for class String itself..but the
last example in manual has that special case. And running that example
shows that this is bullshit:
"This is fixed in PHP 4 by modifying the rule to: 'A
constructor is a function of the same name as the class
it is being defined in.'. Thus in PHP 4, the class B
would have no constructor function of its own and the
constructor of the base class would have been called,
printing 'I am the constructor of A.<br>'."
(as it actually calls the method B()!)
p.s. Someone should clear out those PHP 3 examples and changes out of
the docs altogether as they only cause confusion and only document how
it should behave in PHP 4.
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[2003-02-23 05:56:14] [EMAIL PROTECTED]
No, no and no.
Excerpts:
|In PHP 4, a function becomes a constructor,
|when it has the same name as the class it
|is defined in"
In my example, the function printStr is not defined in class printStr,
so it should not become a constructor according to this statament.
Another example at the bottom of the page you mentioned:
|class A
|{
| function A()
| {
| echo "I am the constructor of A.<br>\n";
| }
|
| function B()
| {
| echo "I am a regular function named B in class
| A.<br>\n";
| echo "I am not a constructor in A.<br>\n";
| }
|}
|
|class B extends A
|{
| function C()
| {
| echo "I am a regular function.<br>\n";
| }
|}
|
|// This will call B() as a constructor.
|$b = new B;
|
|In PHP 3, the function B() in class A will suddenly become
|a constructor in class B, although it was never intended to
|be. The rule in PHP 3 is: 'A constructor is a function of
|the same name as the class.'. PHP 3 does not care if the
|function is being defined in class B, or if it has been
|inherited.
|
|This is fixed in PHP 4 by modifying the rule to: 'A
|constructor is a function of the same name as the class
|it is being defined in.'. Thus in PHP 4, the class B
|would have no constructor function of its own and the
|constructor of the base class would have been called,
|printing 'I am the constructor of A.<br>'.
The above example says, that the B() method becomes a constructor in
PHP 3, but *not* in PHP 4, as there is no constructor defined for class
B itself. Therefore it inherits the base classes constructor, which
exists in the manual's example. In my case, there is no constructor in
the base class. Therefore it should not call any method, as the text
suggests.
So this is not a documented behaviour. In fact it is documented, that
it should not work this way in PHP 4, but only in PHP 3...
------------------------------------------------------------------------
[2003-02-23 01:20:05] [EMAIL PROTECTED]
It's by design and even documented here:
http://www.php.net/manual/en/language.oop.constructor.php
------------------------------------------------------------------------
[2003-02-21 17:37:00] andrew at evilwalrus dot com
According to the comments on the OOP manual page, if a constructor is
not located in the base class, the function of the same name will be
located in subsequent classes, and loaded accordingly. Yes, this is by
design, but no, i personally don't like it... correct me if i'm wrong,
please.
~ Andrew Heebner
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the rest of the comments, please view the bug report online at
http://bugs.php.net/22253
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