I have this multidimensional array
Array
(
[0] => Array
(
[at] => 0
[bt] => 9
)
[1] => Array
(
[at] => 3
[bt] => 5
)
[2] => Array
(
[at] => 0
[bt] => 3
)
)
I want to sort it by key "at" so I tried this code
//$process = array() given above
$p = array();
foreach ($process as $key => $row) {
$p[$key] = $row['at'];
}
array_multisort($p, SORT_NUMERIC, SORT_ASC, $process);
and I get this result
Array
(
[0] => Array
(
[at] => 0
[bt] => 3
)
[1] => Array
(
[at] => 0
[bt] => 9
)
[2] => Array
(
[at] => 3
[bt] => 5
)
)
It sorts the "at" BUT it also sorts "bt".
How can I sort this array on key "at" ONLY?
Like this:
Array
(
[0] => Array
(
[at] => 0
[bt] => 9
)
[1] => Array
(
[at] => 0
[bt] => 3
)
[2] => Array
(
[at] => 3
[bt] => 5
)
)
Thank you.
EDIT:
As for the answer below by callmemath
When I only have this on my array,
Array
(
[0] => Array
(
[at] => 0
[bt] => 9
)
[1] => Array
(
[at] => 0
[bt] => 3
)
)
How can I prevent it from sorting since I only want to sort it by key "at". And nothing to sort there since they are both 0.
Use usort :
$array = array(
array('at' => 0, 'bt' => 9),
array('at' => 3, 'bt' => 5),
array('at' => 0, 'bt' => 3)
);
usort($array, function($a, $b) {
return $a['at'] - $b['at'];
});
var_dump($array);