Add internal flag to forbid dynamic properties #5572
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cmb69
approved these changes
May 18, 2020
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Especially considering #5533 (comment), I'm very much in favor of this.
Zend/zend_weakrefs.c
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| @@ -239,36 +239,6 @@ static void zend_weakref_free(zend_object *zo) { | |||
| #define zend_weakref_unsupported(object, thing) \ | |||
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I believe this can be dropped as well.
This is slightly weaker than the existing code, but I think this makes more sense. In particular something like isset($wr->foobar) should just return false instead of throwing.
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While performing resource -> object migrations, we're adding defensive classes that are final, non-serializable and non-clonable (unless they are, of course). This PR adds a ZEND_ACC_NO_DYNAMIC_PROPERTIES flag, that also forbids the creation of dynamic properties on these objects. This is a subset of #3931 and targeted at internal usage only (though may be extended to userland at some point in the future).
It's already possible to achieve this (what the removed WeakRef/WeakMap code does), but there's some caveats: First, this simple approach is only possible if the class has no declared properties, otherwise it's necessary to special-case those properties. Second, it's easy to make it overly strict, e.g. by forbidding
isset($obj->prop)as well. And finally, it requires a lot of boilerplate code for each class.I think it would be useful to provide this functionality directly, especially as it's so easy/cheap.