PHP: asort() function

Last update on August 19 2022 21:50:40 (UTC/GMT +8 hours)

PHP: Sort an array and maintain index association

The asort() function is used to sorts an array. The function maintains index association.

This function is used mainly when sorting associative arrays where the actual element order is significant.

Version:

(PHP 4 and above)

Syntax:

asort(array_name, sort_type)

Parameters:

Name	Description	Required / Optional	Type
array_name	Specifies the name of the array to sort.	Required	Array
sort_type	Sets the sorting behavior. Possible type : SORT_REGULAR - Compare items normally. SORT_NUMERIC - Compare items numerically. SORT_STRING - Compare items as strings. SORT_LOCALE_STRING - compare items as strings, based on the current locale	Optional	Integer

Return value:

TRUE on success or FALSE on failure.

Value Type: Boolean.

Example:

<?php
$subject = array('d' => 'Language',  'c' => 'Math',  'a' => 'Science', 'b'=> 'Geography');
asort($subject);
foreach ($subject as $key => $val)
{
echo "$key = $val <br />";
}
?>

Output:

b = Geography
d = Language
c = Math
a = Science

View the example in the browser

Practice here online :

See also

PHP Function Reference

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