How to sort an array in array by a specific key in PHP [duplicate]

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Possible Duplicate:

Sorting an associative array in PHP

How to sort a multidimensional array by a certain key?

I would like to know how can I sort an array in array by a specific key.

For example:

$array = array( 0 => array("id"=>25), 1 => array("id"=>15) , 2 => array("id"=>19) );

now I want to sort the array by the key "id", 开发者_Python百科i'm expecting this result:

$array = array( 0 => array("id"=>15), 1 => array("id"=>19) , 2 => array("id"=>25) );

Anybody can help ?

Thanks

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Hope this may work.

function cmp($a, $b){
    return $a['id'] - $b['id'];
}
usort($array, 'cmp');