string function_exists( string str, object ob );
Return the file name of the object that defines the function 'str' in object 'ob'. The returned value can be other than 'file_name(ob)' if the function is defined by an inherited object.
0 is returned if the function was not defined.
Note that function_exists() does not check shadows, or functions that cannot be called from outside the object.
See also: call_other
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