I have a multi-dimensional array -- an array of associative arrays --
that I would like to sort in a number of non-trivial ways (i.e., sort,
asort, ksort are not sufficient). I'm trying to figure out how to do
this using usort without creating a dozen different functions. The
array has as structure similar to the following:
Array
(
[0] => Array
(
[name] => Alice
[title] => Teacher
[num] => 10
)
[1] => Array
(
[name] => Ben
[title] => Programmer
[num] => 20
)
[2] => Array
(
[name] => Carl
[title] => Executive
[num] => 30
)
)
Currently I have to create three different functions to sort on each
of the three fileds (name, title, num) like so:
function sort_by_name ($a, $b) {
return strcasecmp($a['name'], $b['name']);
}
function sort_by_title ($a, $b) {
return strcasecmp($a['title'], $b['title']);
}
function sort_by_name ($a, $b) {
return ($a['num'] < $b['num']);
}
Then I call it in an if statement:
if($_GET['sort'] == 'name') {
sort($array, "sort_by_name");
} elseif($_GET['sort'] == 'title') {
sort($array, "sort_by_title");
} elseif($_GET['sort'] == 'num') {
sort($array, "sort_by_num");
}
Of course, if I want to do reverse sorting, I have to create three
more functions and three more if statements. Does anyone have a
suggestion on how I could pass data through usort to the callback
function, such as a flag indicating reverse (or not), and a variable
indicating the field name to sort on? Then this could all be done
with one function.
Thanks!
Dean
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