arsort
Name
arsort — Sorts the given array in descending order by
element value.
Synopsis
bool arsort(array[, . .
.]);
array array: Array to be
sorted
int . . . (optional): Flag
specifying how to compare element values (PHP 4.0.0+
only)
Returns
TRUE on success; FALSE on error
Description
Sorts the elements of the array given by array in descending order by element
value while maintaining the key/value associations. This
function differs from rsort() in that it works with
both associative and indexed arrays.
This function operates directly on the passed array.
After calling arsort() , the internal array
pointer is on the first element of array .
(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.
See also
See also array_multisort() , asort() , krsort() , ksort() , natsort() , natcasesort() , rsort() , sort() , uasort() , uksort() , usort()
Example
Example 39. Sort an array in
reverse order by value
echo "Unsorted:\n";
$my_array = array("x" => "c", "z" => "a", "y" => "d", "w" => "b");
echo "Unsorted:\n";
while (list($key, $val) = each($my_array)) {
echo "Key: $key Val: $val\n";
}
arsort($my_array);
echo "Sorted:\n";
while (list($key, $val) = each($my_array)) {
echo "Key: $key -- Val: $val\n";
}
Output:
Unsorted:
Key: x -- Val: c
Key: z -- Val: a
Key: y -- Val: d
Key: w -- Val: b
Sorted:
Key: y -- Val: d
Key: x -- Val: c
Key: w -- Val: b
Key: z -- Val: a
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
(Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch).
This material may be distributed only subject to the terms and conditions set forth
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http://www.opencontent.org/openpub/).
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and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4
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