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Php ini What isThe unserialize callback function will be called (with the undefined class name as parameter), if the unserializer finds an undefined class which should be instantiated.
A warning appears if the specified function is not defined, or if the function doesn't include/implement the missing class. So only set this entry, if you really want to implement such a callback-function.
This directive allows you to control the response of the unserializer when a request is made to instantiate an undefined class.
For most users, this directive is irrelevant because PHP already outputs a warning in such instances if PHP's error reporting is tuned to the appropriate level.
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