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    <p>Are you receiving this serialized object from a service/stream or reading it from a file? I've seen it happen in a client-server setting the client side object and the server side objects differ very slightly... maybe have a property that the other doesn't have. This also happens when you serialize an object, save it to file, then refactor code that removes a class and then try's to deserialize the object.</p> <p>Then when it gets deserialized and tries to instantiate the needed classes they don't exist.</p> <p>The error is clear and straightforward, you're creating a object for which the class has not been loaded. </p> <p>I'd do a string search on your code, find where the needed class is located, and make a simple autoloader (or just a raw include/require) of the file. Just get the class it needs loaded somehow.</p> <p>If the class really doesn't exist anywhere, try checking earlier revisions (I'm assuming you have version control of some type) for existence of the class. If you're deserializing an object generated by another system check that system out as well.</p>
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    1. USRay
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    1. COI'm using the standard file-based sessions provided by the default PHP session handler, so this information is purely server-side. And no, you are incorrect. The class definition IS loaded. It is trying to load the WRONG definition. As proof, sometimes it picks a random string that actually DOES match with a defined class. In these cases, it creates an instance of that class from the session content, and then (our code) proceeds operate on it with functions that don't exist in that incorrect class, which is where we get some error logs as well.
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      1. USVexedPanda
    2. CO@VexedPanda try logging the object to a file (use var_export on the object and save it) right before you serialize it with a timestamp. The next time you see the error, check the log to see the state of the object prior to serializing to confirm the object is as expected going into the session.
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    3. CO@VexedPanda also, you mention you have a FM_LoginLogging class... I use zend framework 1.x. Before php 5.3, Zend had a bunch of work arounds for namespacing and autoloading. I know it allowed you to namespace and autoload without class prefixes... so for example a class FM_LoginLogging could be set to autoload sans the "FM_" prefix. In this case you'djust use 'LoginLogging' and it would map the class. Something like this could be a problem if PHP saves the object with it's true class name, but an internal object reference inside the framework uses the shortend class name (or vice versa).
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