sorting an array with unsorted index - php

Question

i got an array like this with unsorted outer index.
$a = array(
(1) => array(1, 2, 3, 0, 5, 4),
(0) => array(2, 1, 5, 0, 3, 4)
);
echo "<br/>Before Sorting: ";
print_r($a);
foreach($a as $b)
array_multisort($b, SORT_ASC, SORT_NUMERIC);
echo "<br/>After Sorting: ";
print_r($a);
which gives me output as below
Before Sorting:
Array
(
[1] => Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 0
[4] => 5
[5] => 4
)
[0] => Array
(
[0] => 2
[1] => 1
[2] => 5
[3] => 0
[4] => 3
[5] => 4
)
)
After Sorting:
Array
(
[1] => Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 0
[4] => 5
[5] => 4
)
[0] => Array
(
[0] => 2
[1] => 1
[2] => 5
[3] => 0
[4] => 3
[5] => 4
)
)
AND WHAT I WANT IS
$a = array(
(0) => array(2, 1, 5, 0, 3, 4),
(1) => array(1, 2, 3, 0, 5, 4)
);
please tell me how to deal with.........

Answer 1

How about just using ksort (as you need to reorder your array by key)?
$a = array(
1 => array(1, 2, 3, 0, 5, 4),
0 => array(2, 1, 5, 0, 3, 4)
);
echo "<br/>Before Sorting: ";
print_r($a);
ksort($a);
echo "<br/>After Sorting: ";
print_r($a);

Answer 2

Since you're only wanting to sort by the top level indices, you don't need to use multisort. You don't even need a loop.
Try this:
$a = array(
(1) => array(1, 2, 3, 0, 5, 4),
(0) => array(2, 1, 5, 0, 3, 4)
);
ksort($a);
print_r($a);
Should give you what you want.
See http://www.php.net/manual/en/function.ksort.php for more info.