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Posted by Gordon Heydon on 07/29/05 04:22
Hi,
I have an interesting problem that I cannot explain with using the
__set() and __get() when playing with arrays.
Basically with a normal object if you store an array as a property you
can manipulate it like an array. eg.
$obj->prop[5] = 'apple';
In this example if $obj->prop is an array then the position 5 will then
contain 'apple'. This is expected behaviour and works very well.
Now if you use the following code and use overloading you can do the
same thing.
--8<--
<?php
class ex {
public function __get($prop) {
echo "getting property $prop\n";
return $this->fields[$prop];
}
public function __set($prop, $value) {
echo "setting property $prop\n";
$this->fields[$prop] = $value;
}
private $fields;
}
$obj = new ex;
$obj->prop = array(4 => 'pear');
$obj->prop[5] = 'apple';
?>
--8<--
as expected it will work exactly the same as the first example. but the
output "setting property prop" is not shown when the $obj->prop[5] which
I find a little strange.
but now if I do not store the values in the object as an array but store
them as something else like a serialized string it will not work. eg.
--8<--
<?php
class ex {
public function __get($prop) {
echo "getting property $prop\n";
return unserialize($this->fields[$prop]);
}
public function __set($prop, $value) {
echo "setting property $prop\n";
$this->fields[$prop] = serialize($value);
}
private $fields;
}
$obj = new ex;
$obj->prop = array(4 => 'pear');
$obj->prop[5] = 'apple';
?>
--8<--
Now this example will not work. Could someone please help me understand
why. I have a funny feeling that the __set() is not being called, and
something in the php5 overload code is guessing what should happen and
doing it.
I am not on the php-general mail list so any replies can you please send
it directly to me.
Thanks to anyone that can solve this for me.
Gordon.
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