Possible Duplicate:
How do I sort a multidimensional array in php
I have an array like:
Array
(
[0] => Array
(
[lop] => 7A1
[tongdiem] => 4
)
[1] => Array
(
[lop] => 7A2
[tongdiem] => 5
)
[2] => Array
(
[lop] => 7A3
[tongdiem] => 6
)
[3] => Array
(
[lop] => 7A4
[tongdiem] => 30
)
[4] => Array
(
[lop] => 7A5
[tongdiem] => 21
)
)
And I need sort [tongdiem] ASC, but not change array key, this like:
Array
(
[0] => Array
(
[lop] => 7A1
[tongdiem] => 4
)
[1] => Array
(
[lop] => 7A2
[tongdiem] => 5
)
[2] => Array
(
[lop] => 7A3
[tongdiem] => 6
)
[3] => Array
(
[lop] => 7A5
[tongdiem] => 21
)
[4] => Array
(
[lop] => 7A4
[tongdiem] => 30
)
)
I have tried asort, some php array build-in function, but not working.
I need sort array with [tongdiem] value ASC, but not change array key.
How do I do?