rsort

bool rsort(array array, [int flag]) 

array	Array to sort
flag	Flag specifying how to compare key values (PHP 4.0.0+ only)

Sorts an array in descending order by element value.

Returns:

TRUE on success; FALSE on failure

Description:

Sorts array in descending order by element value. String indexes are ignored and the resulting array is indexed numerically. Use arsort() if you're working with an associative array. The key values for the resulting indexed array are reordered after the sort is completed.

array is modified directly by this function.

(PHP 4.0.0+ only) The way in which element values are compared can be modified by passing one of the following named constants as flag :

SORT_REGULAR	Compare element values according to PHP's normal comparison rules. This is the default if flag is not given.
SORT_NUMERIC	Compare element values according to their numeric values.
SORT_STRING	Compare element values according to their string values.

Version:

PHP 3, PHP 4

See also:

array_multisort() 
arsort() 
asort() 
krsort() 
ksort() 
natsort() 
natcasesort() 
sort() 
uasort() 
uksort() 
usort() 

Example:

Sort an array in descending order by element value

$array = array('b' => 2, 'd' => 4, 'a' => 1, 'c' => 3); 
rsort($array); 
print_r($array); 

Output (note that string indexes have been lost): 
Array 
(
    [0] => 4 
    [1] => 3 
    [2] => 2 
    [3] => 1 
)