Dean Householder wrote:
>
> 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
...
> 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.
Well, you can't pass any more vars through usort, but you could use a
global variable (ick) ooooorr..you could do some really sticky stuff
with create_function, which I wouldn't recommend, since it doesn't do
much for readability, but consider the following:
<?php
function sortit($key, $direction=0){
return create_function('$a,$b', '
if($a["'.$key.'"] == $b["'.$key.'"]){
return 0;
}
if($a["'.$key.'"] '.($direction ? '>' : '<').' $b["'.$key.'"]){
return -1;
}else{
return 1;
}
');
}
$arr= array(
array(
'name' => 'bill',
'age' => 20
),
array(
'name' => 'abe',
'age' => 19
)
);
print_r($arr);
uasort($arr, sortit('name'));
print_r($arr);
uasort($arr, sortit('name', 1));
print_r($arr);
?>
That COULD do what you're looking for.
--
regards,
Nezar Nielsen
http://fez.dk
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