I am attempting to sort an array within a class using the usort command, but am having difficulty in formating the function name parameter. The usort command is normally used like this: usort ($array, "compareFunction") where the compare function is included within quotes as shown. My problem is that I am trying to use this within a class. My compare function is called sortChannels. In a class I would call the function using $this->sortChannels. But, I cannot figure out how to call the class function within usort. I have tried: usort($array, this->sortChannels); usort($array, "this->sortChannels"); usort($array, this->"sortChannels"); usort($array, sortChannels); usort($array, "sortChannels"); I keep getting the error - Warning: usort(): Invalid comparison function. Any ideas onhow I should format the class function within usort? Michael J

After re-reading the usort manual on php.net for the 3rd or 4th time and some more trial and error I found the solution. usort($array, array("className", "sortChannels")); Michael J