I recently needed to display a list of authors within a WordPress blog. The goal was to sort the author list by number of posts before outputting the list. The method for calculating number of posts isn't a sortable key within WordPress' get_posts, so I had to sort the result list myself. PHP's usort method, along with a custom function, allows you to accomplish the feat of sorting a collection of objects by key.
The PHP
The first step is creating the function that does the sorting -- this is that function:function sort_objects_by_total($a, $b) {
The PHP
The first step is creating the function that does the sorting -- this is that function:function sort_objects_by_total($a, $b) {
if($a->total_posts == $b->total_posts){
return 0 ;
}
return ($a->total_posts < $b->total_posts) ? -1 : 1;
}
The function returns -1 (smaller than), 0 (equal to), or 1 (larger than) when doing the sort comparisons. The last is applying the sortation function to the array, which is done by usort:usort($users, 'sort_objects_by_total');
The code above now ensures that my authors array is sorted by total_posts. Keep this snippet in your PHP toolbox for the future -- I'm certain you'll need it at one time or another.
The function returns -1 (smaller than), 0 (equal to), or 1 (larger than) when doing the sort comparisons. The last is applying the sortation function to the array, which is done by usort:usort($users, 'sort_objects_by_total');
The code above now ensures that my authors array is sorted by total_posts. Keep this snippet in your PHP toolbox for the future -- I'm certain you'll need it at one time or another.
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