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If obj is an object, returns the name of the parent class of the class of which obj is an instance.
If obj is a string, returns the name of the parent class of the class with that name. This functionality was added in PHP 4.0.5.
Note: Since PHP 5, obj is optional if called from the object's method.
See also get_class() and is_subclass_of().
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Generated: 2007-01-26 18:00:04