You want to define a custom sorting routine to order an array. However, instead of using a function, you want to use an object method.
Pass in an array holding a class name and method in place of the function name:
usort($access_times, array('dates', 'compare'));
As with a custom sort function, the object method needs to take two input arguments and return 1, 0, or -1, depending if the first parameter is larger than, equal to, or less than the second:
class pc_sort { // reverse-order string comparison function strrcmp($a, $b) { return strcmp($b, $a); } } usort($words, array('pc_sort', 'strrcmp'));
Chapter 7 for more on classes and objects; Recipe 4.18 for more on custom sorting of arrays.
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