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Re: out of sheer curiosity... [message #177626 is a reply to message #177610] Wed, 11 April 2012 08:40 Go to previous messageGo to previous message
M. Strobel is currently offline  M. Strobel
Messages: 386
Registered: December 2011
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Senior Member
Am 10.04.2012 23:08, schrieb Jerry Stuckle:
> On 4/10/2012 12:54 PM, M. Strobel wrote:
>> Am 10.04.2012 13:28, schrieb Thomas Mlynarczyk:
>>> M. Strobel schrieb:
>>>
>>>> Now PDO comes in. When getting a query result as object your constructor is called
>>>> *after* the properties are set.
>>>
>>> Really? That would be very strange indeed.
>>>
>>> [minutes later]
>>> I just tested it and it is indeed as you state. Thanks for pointing that out -- is
>>> this documented?
>>>
>>>> I found it quite annoying to have an exception from the rule. But thinking more
>>>> about
>>>> it I found out they had a choice of either calling __construct() after setting the
>>>> data, or to define another magic method like __pdoconstruct() to give the programmer
>>>> a chance to adapt the init process to the data.
>>>
>>> I don't quite follow you here. Why did they have no choice? I don't see why they
>>> (c|sh)ould not call the constructor before setting the data. After all, that would be
>>> the only logical and sensible thing to do. If you would do this "manually", you would
>>> do it like this:
>>>
>>> foreach ( $rows as $row ):
>>> $item = new MyClass( 'foo', 'bar' );
>>> foreach ( $row as $name => $value ):
>>> $item->$name = $value;
>>> endforeach;
>>> $result[] = $item;
>>> endforeach;
>>>
>>
>> Meanwhile I have more ideas about choices.
>>
>> The correct way would have been to pass the row to the constructor. This would have
>> required a matching parameter definition for the constructor, and the corresponding
>> code, quite error prone.
>>
>
> Yes, that's how C++ does it, for instance (overloaded functions). It would be harder
> in PHP, but it could be done.
>
>> 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.
>>
>>> And I guess it would be impossible to do it the other way round (first setting data,
>>> then calling constructor). The setting of the data can be controlled using the magic
>>> __set() method, so there's no need for __pdoconstruct(), if I understand you
>>> correctly.
>>
>> Are you aware of the fact that __set() is not called for defined variables? Test:
>> <?php
>> class Upset {
>> public $var1;
>> function __set($n, $v) {
>> echo "setting variable $n to: $v\n";
>> $this->$n = $v;
>> }
>> }
>> $c = new Upset();
>> $c->var1 = 'Try this';
>> $c->another = ' and this ';
>> echo "Values are now $c->var1 $c->another\n";
>> ------------------- Result: ----
>> setting variable another to: and this
>> Values are now Try this and this
>>
>>
>
> That is correct - you are directly setting a public variable. Now make $var1 private
> and see what happens.

Let's see, this gives a good reference:

<?php
class Upset {
public $pubvar;
private $privvar;
function __set($n, $v) {
echo "setting variable $n to: $v\n";
$this->$n = $v;
}
function __get($n) {
echo "getting variable $n\n";
if (isset($this->$n)) return $this->$n;
else return null;
}
}
$c = new Upset();
$c->pubvar = 'Try this';
$c->privvar = ' private ';
$c->adhoc = ' and this ';
echo "Values are now $c->pubvar $c->privvar $c->adhoc\n";
------------------- Result is: ----
setting variable privvar to: private
setting variable adhoc to: and this
getting variable privvar
Values are now Try this private and this


/Str.

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