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PHP Readonly Properties?
I want a property to be publicly visible:
echo $object->prop;
but I don't want to be modifiable.
Are there other options to make this happen, besides using __get?
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3Are you looking for read only properties? http://stackoverflow.com/questions/402215/php-readonly-properties – Aaron McIver Feb 10 '12 at 20:04
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yes, something like that. But the solution you linked uses __get too – Alex Feb 10 '12 at 20:09
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If you don't want to use `__get`, then yes, getter methods are the best bet. You could alternatively implement `ArrayAccess` but this likely isn't any more performant that `__get` – Feb 10 '12 at 20:17
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As an alternative to to __get() and regular getter/setter I sometimes take approach to copy public properties to protected/private when object needs to enter a "locked" state. Not quite the same as making them read-only, but reduces mess while maintaining performance when nothing really cares about the values from outside. :) – Slava Feb 10 '12 at 20:31
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the question is somewhat misphrased. if you want to modify a property you use a setter. A getter only provides access to the property. The magic methods __get and __set are not Getters and Setters though. They are error handlers that get triggered when trying to access/mutate an inaccessible property. – Gordon Feb 10 '12 at 20:40
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there is no other way to do read only public properties. many might suggest that you make the property protected and just make a getter method. $object->getProp(). – dqhendricks Feb 10 '12 at 20:48
2 Answers
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Other ways I can think of:
- Use a
__set()function and ignore the setting. - Don't use that variable at all, but create a getVal() function, and no setVal() function.
Hope this helps :)
Mikhail
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#1 won't work if the variable is visible to outsiders -- `__set` only runs when someone tries to set a property that doesn't exist, or is private. In cases where `__set` would run, you'd need a `__get` too. – cHao Feb 11 '12 at 00:12
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Are there other options to make this happen, besides using __get?
No, but there is feature request for it: https://bugs.php.net/bug.php?id=46506 so you can vote for importance of it and hope that this will be resolved in near future.
But I don't think it will be near future since this feature will create a lot of confusion, like objects stored in properties - they are only references to the object, so making them visible allows you to operate on it's methods / properties.
As for now, creating proper getter for every property, that you want to be read-only, seems to be the best solution.
dev-null-dweller
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