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Re: out of sheer curiosity... [message #177611 is a reply to message #177606] Tue, 10 April 2012 21:11 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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On 4/10/2012 2:10 PM, Thomas Mlynarczyk wrote:
> M. Strobel schrieb:
>
>> In your example above the problem is if you need to do more init work
>> on the data you
>> need an extra method call. With the implemented solution you just have
>> to know that
>> the constructor is called after setting the vars, and you can detect
>> it, testing the
>> unique key or so, but need not do so if you don't care.
>
> Hm, yes, but it still feels wrong to me that the constructor call is not
> the very first thing happening to the object.
>

I agree that it "feels wrong", but is perfectly valid. There are other
examples - for instance in Java and C++, the vase class constructor is
called before the derived class constructor.

>> Are you aware of the fact that __set() is not called for defined
>> variables?
>
> Yes, it's not called for defined /public/ variables. But you rarely have
> public variables in your classes.
>
>> The rationale (or use case) of __set_state() is a mystery to me.
>
> Well, it's used by var_export() when exporting objects. For example,
>
> $a = (object) array( 'foo' => 'bar' );
>
> will be exported as
>
> stdClass::__set_state(array( 'foo' => 'bar', ))
>
> even though PHP should know very well that stdClass has no such static
> method. Consequently, writing the output of var_export() to a file and
> then re-including it, will fail, thus defeating the whole purpose of
> var_export(). Test code:
>
> $a = (object) array( 'foo' => 'bar' );
> $s = var_export( $a, true );
> var_dump( $a, $s );
> $b = eval( "return $s;" );
> var_dump( $b );
>
> But __set_state() seems to be some sort of "factory method" which is
> called as a static method on a class, passing an array with "state
> information" and the method is supposed to create an object, set its
> state using the passed array and return the new object. And that would
> be exactly what PDO needs to set the data of the row object: no need to
> define an array with extra constructor arguments -- just tell PDO the
> class name and make sure the class has a __set_state() method defined.
> But alas, it's not what PDO does.
>
> Greetings,
> Thomas
>

Possibly for future use? Most of PDO was written before __set_state()
was added, so maybe newer versions will use it.

--
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
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