PHP ksort() Function

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 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 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

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Reference: http://php.net/manual/en/function.ksort.php

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