sorting multidimensional array

[m_leefs]

I am sorting a multidimensional array ($listing), using the following code:

function compare ($x, $y) {
 if ( $x[1] == $y[1] )
 return 0;
 else if ( $x[1] < $y[1] )
 return -1;
 else
 return 1;
}
usort ($listing, 'compare');

However, I would like to set up a sorting function in which I can dynamically select which value to sort by. So I tried multiple varients of the below code, but I can't seem to get the "$i" varible to work. Is there a way around this, or a better script out there?

$i = 1; // or what ever value I select
function compare ($x, $y) {
 if ( $x[$i] == $y[$i] )
 return 0;
 else if ( $x[$i] < $y[$i] )
 return -1;
 else
 return 1;
}
usort ($listing, 'compare');

Oh and Merry Christmas!

[mincklerstraat]

I'd have a look at

array_multisort() [be.php.net]

.