posted 06/10/2008 by James

If you're using the function usort inside a cakephp controller and are receiving errors like "Warning: usort() [function.usort]: Invalid comparison function in..." you may be referencing your sorting function incorrectly.

 

Try calling usort this way...

 

class ItemsController extends AppController {

    // if reusable, then you should consider putting this function in app_controller.php

    function item_sorter($a,$b) {

        //... comparison logic

    }

    function doSomething($unsorted_list) {

        usort($unsorted_list, array('ItemsController','item_sorter'));

        //$unsorted_list is now sorted

    }

}

Tags: php / usort / cakephp / code

COMMENTS (displaying 0 comments)

POST (leave a comment)

POPULAR BLOG TAGS

hobnox debuggeddesigns gmail class general php5tube rot13 cakephp code snowboard usort privacy ableton drum machines as science skateboard trice mailto spam routes security color magazine sports geek quicksilver encryption open source release google regular expressions 1984 orwell charlie mit germans defcon launch email bakery mbta flash brain boston published php whoami captcha youtube