PHP ksort() Function

Last Updated : 17 Mar 2025

The PHP ksort() sorts an associative array in ascending order, according to the key. It is mainly used for an associative array. This function was introduced in PHP 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies the array to use.	compulsory
sort_flag	It specifies how to sort the array values. Possible values - SORT_REGULAR - Default. Treat values as they are (don't change types) SORT_NUMERIC - Treat values numerically SORT_STRING - Treat values as strings SORT_LOCALE_STRING - Treat values as strings, based on local settings.	Optional

Returns

The ksort() function returns true on success and false on failure.

Example 1

<?php
$age=array("sachin"=>"45","virat"=>"29","ganguly"=>"46");
ksort($age);
print_r($age);
?>

Output:

Array
(
    [ganguly] => 46
    [sachin] => 45
    [virat] => 29
)

Example 2

<?php
$sports = array( a=>'cricket', b=>'hockey', c=>'football', d=>'badminton');
	ksort($sports);
	print_r($sports);
?>

Output:

Array
(
    [a] => cricket
    [b] => hockey
    [c] => football
    [d] => badminton
)

Example 3

<?php
$country = array(
		"india" => "new delhi", 
		"france" => "paris", 
		"china" => "beijing", 
		"united kingdom" => "london", 
		"russia" => "moscow"); 
ksort($country); 
print_r($country); 
?>

Output:

Array
(
    [china] =>beijing
    [france] =>paris
    [india] =>newdelhi
    [russia] =>moscow
    [united kingdom] =>london
)

Example 4

<?php
$lang = array("x" => "html", "y" => "java", "z" => "ruby");
krsort($lang);
print_r($lang);
?>

Output:

Array
(
    [z] => ruby
    [y] => java
    [x] => html
)

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PHP ksort() Function

Syntax

Parameter

Returns

Example 1

Example 2

Example 3

Example 4

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PHP ksort() Function

Syntax

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Example 1

Example 2

Example 3

Example 4

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