Unserialize and Autoload in php
When deserializing an object, if the object’s class definition does not exist, then PHP will introduce an unfinished class Concept, namely: __PHP_Incomplete_Class. Although we have successfully deserialized at this time, we still cannot access the data in the object, otherwise the following error message will appear: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition. This is not difficult, just do a forced type conversion and turn it into an array:
But if the system has Autoload activated, the situation will become more complicated. By the way: PHP actually provides a configuration option called unserialize_callback_func, but its meaning is similar to autoload. I won’t introduce it here. Let’s just talk about autoload. The example is as follows:
Execute the above code and you will find that spl_autoload_register is triggered. Most of the time this makes sense, but if you encounter an improperly defined spl_autoload_register, it will be tragic, such as the following This code:
No doubt, because the class definition file cannot be found, an error is reported! It is definitely possible to change spl_autoload_register, but the premise is that you can change it. If third-party code is involved, we cannot make the decision without authorization. At this time, we need a way to allow unserialize to bypass autoload. The simplest way is to add the class we need FAKE out:
I have to say that the above code is really rubbish. To provide you with one person I wrote:
Although there is a bit more code, at least there is no FAKE class, which makes it look more comfortable. |

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