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asort — Sorts the given array in ascending order.


void asort(array[, . . .]);
array array: Array to be sorted
int . . . (optional): Flag specifying how to compare element values (PHP 4.0.0+ only)




Sorts the elements of the array given by array in ascending order by element value while maintaining the key/value associations. This function differs from sort() in that it works with both associative and indexed arrays; the a in asort() stands for associative.

This function operates directly on the passed array.

After calling asort() , 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.


PHP 3, PHP 4


Example 40. Sort an array in ascending order by value

echo "Unsorted:\n";
$my_array = array("x" => "d", "z" => "c", "y" => "b", "w" => "a");
while (list($key, $val) = each($my_array)) {
   echo "Key: $key Val: $val\n"; 
$ret = asort($my_array);
echo "--After sorting--\n";
echo "Sorted:\n";
while (list($key, $val) = each($my_array)) {
   echo "Key: $key -- Val: $val\n"; 

Key: x Val: d
Key: z Val: c
Key: y Val: b
Key: w Val: a
--After sorting--
Key: w -- Val: a
Key: y -- Val: b
Key: z -- Val: c
Key: x -- Val: d

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 in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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