I need to sort the array in descending order. I use asort
in order to save proper reference to keys. However, $ind
is null. Why?
$selected = array();
for ($i=0; $i<10; $i++) {
$selected[] = array('ind' => $i, 'rank' => rand(0,10));
}
asort($selected, SORT_NUMERIC);
$ind = $selected['ind'];
After your for()
loop you have something like this:
Array (
[0] => Array (
[ind] => NUM
[rank] => NUM
[1] => Array (
[ind] => NUM
[rank] => NUM
etcetcetc....
)
This is called a multidimensional array, and you access the inner arrays in a similar way as you do single-dimensional arrays.
You can access it with a $array[0]['ind']
, or possibly even a foreach()
loop so you get all the values.
$ind = array();
foreach($array as $line) {
$ind[] = $line['ind'];
}
Now the $ind
array has all the values in a single-dimensional array, that you can access with: $ind[0]
or $ind[1]
, giving you the ind
value.
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