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PHP ksort() Function

Last Updated : 11 Jul, 2025
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The ksort() function is an inbuilt function in PHP which is used to sort an array in ascending order according to its key values. It sorts in a way that the relationship between the indices and values is maintained. Syntax: 
bool ksort( $array, $sorting_type )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $array: This parameter specifies the array which needs to be sorted. It is a mandatory parameter.
  • $sorting_type: This is an optional parameter. There are different sorting types which are discussed below:
    • SORT_REGULAR: The value of $sorting_type is SORT_REGULAR then items are compare normally.
    • SORT_NUMERIC: The value of $sorting_type is SORT_NUMERIC then items are compared numerically.
    • SORT_STRING: The value of $sorting_type is SORT_STRING then items are compared as a string.
    • SORT_LOCALE_STRING: The value of $sorting_type is SORT_STRING then items are compare as strings, based on the current locale.
Return Value: This function returns True on success or False on failure. Below programs illustrate the ksort() function in PHP. Program 1: php 
<?php
// PHP program to illustrate
// ksort()function

// Input different array elements
$arr = array("13" =>"ASP.Net",
             "12" =>"C#",
             "11" =>"Graphics",
             "4" =>"Video Editing",
             "5" =>"Photoshop",
             "6" =>"Article",
             "4" =>"Placement",
             "8" =>"C++",
             "7" =>"XML",
             "10" =>"Android",
             "1" =>"SQL",
             "2" =>"PL/Sql",
             "3" =>"End",
             "0" =>"Java",       
        );

// Implementation of ksort()
ksort($arr);

// for-Loop for displaying result
foreach ($arr as $key => $val) {
    echo "[$key] = $val";
    echo"\n";
}

?>
Output: 
[0] = Java
[1] = SQL
[2] = PL/Sql
[3] = End
[4] = Placement
[5] = Photoshop
[6] = Article
[7] = XML
[8] = C++
[10] = Android
[11] = Graphics
[12] = C#
[13] = ASP.Net
Program 2: php 
    
<?php
// PHP program to illustrate
// ksort function
    
// Input different array elements
$arr = array("z" => 11,
             "y" => 22,
             "x" => 33,
             "n" => 44,
             "o" => 55,
             "b" => 66,
             "a" => 77,
             "m" => 2,
             "q" => -11,
             "i" => 3,
             "e" => 56,
             "d" => 1,                            
        );

// Implementation of ksort
ksort($arr);

// for-Loop for displaying result
foreach ($arr as $key => $val) {
    echo "[$key] = $val";
    echo"\n";
}

?>
Output: 
[a] = 77
[b] = 66
[d] = 1
[e] = 56
[i] = 3
[m] = 2
[n] = 44
[o] = 55
[q] = -11
[x] = 33
[y] = 22
[z] = 11
Related Articles: Reference: https://www.php.net/manual/en/function.ksort.php

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