Sorting a multi-dimensional array

[Anon]

How can I sort this multi-dimensional array in alphabetical order on 'color'. I want to keep banana with yellow, lettuce with green, and tomato with red:

$my_array=array(array(food=>"banana",color=>"yellow"),array(food=>"lettuce",color=>"green"),array(food=>"tomato",color=>"red"));

Unsorted (current)

echo $my_array[0][food]."=".$my_array[0][color]; // prints banana = yellow
echo $my_array[1][food]."=".$my_array[1][color]; // prints lettuce = green
echo $my_array[2][food]."=".$my_array[2][color]; // prints tomato = red

Sorted

echo $my_array[0][food]."=".$my_array[0][color]; // prints lettuce = green
echo $my_array[0][food]."=".$my_array[0][color]; // prints tomato = red
echo $my_array[0][food]."=".$my_array[0][color]; // prints banana = yellow

[dannys]

I'm trying to work out this very problem too, might need to split it into many indexed arrays - sort the required arrays and then get the others to line up by using the index.
It's a messy and time consuming solution though which is why it's my 'plan z' and i'm looking for something else.

[spider_man]

Here,

function cmp ($a, $b) {
return strcmp($a["color"],$b["color"]);
}

usort($my_array, "cmp");

while (list ($key, $value) = each ($my_array)) {
echo "\$my_array[$key]: " . $value["color"] . "\n";
}

--Make things as simple as you can, but not simpler.

A. Einstein.