Ranking elements of an array

[vijay]

I have an array like

$a = array('US'=>50, 'CA'=>20, 'GB'=>90, 'MX'=>30);.

What I want is a rank of the keys according to their corresponding
values. For instance, since 'GB' is 90, GB is the first. In this
example, the result I want is an array

$r = array('GB', 'US', 'MX', 'CA');

Are there any functions that I can use to get this without having to
write "for loop"s?

[Gordon]

On Aug 22, 5:20*pm, vijay <[e-mail]:

I have an array like

$a = array('US'=>50, 'CA'=>20, 'GB'=>90, 'MX'=>30);.

What I want is a rank of the keys according to their corresponding
values. For instance, since 'GB' is 90, GB is the first. In this
example, the result I want is an array

$r = array('GB', 'US', 'MX', 'CA');

Are there any functions that I can use to get this without having to
write "for loop"s?

http://uk.php.net/manual/en/function.asort.php

[Michael Fesser]

..oO(vijay)

>I have an array like

$a = array('US'=>50, 'CA'=>20, 'GB'=>90, 'MX'=>30);.

What I want is a rank of the keys according to their corresponding
values. For instance, since 'GB' is 90, GB is the first. In this
example, the result I want is an array

$r = array('GB', 'US', 'MX', 'CA');

Are there any functions that I can use to get this without having to
write "for loop"s?

<?php
$a = array('US'=>50, 'CA'=>20, 'GB'=>90, 'MX'=>30);
arsort($a);
$r = array_keys($a);
?>

Micha