PHP krsort() Function (original) (raw)

Last Updated : 20 Jun, 2023

The krsort() function is an inbuilt function in PHP which is used to sort an array by key in reverse order according to its index values. It sorts in a way that relation between indices and values is maintained.

Syntax:

bool krsort( array,array, array,sorting_type )

Parameters: This function accepts two parameters as mentioned above and described below:

$array: This parameter specifies the array which to be sort. 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 compares numerically.
- SORT_STRING: The value of $sorting_type is SORT_STRING then items are compares as string.
- SORT_LOCALE_STRING: The value of $sorting_type is SORT_STRING then items are compares as string, based on current locale.

Return Value: This function returns True on success or False on failure.

Below programs illustrate the krsort() function in PHP.
Program 1:

<?php

$arr = array ( "0" => "Technology" ,

`` "1" => "Machine" ,

`` "2" => "GeeksforGeeks" ,

`` "3" => "Graphics" ,

`` "4" => "Videos" ,

`` "5" => "Report" ,

`` "6" => "Article" ,

`` "7" => "Placement" ,

`` "8" => "Contribute" ,

`` "9" => "Reset" ,

`` "10" => "Copy" ,

`` );

krsort( $arr );

foreach ( $arr as $key => $val ) {

`` echo "[$key] = $val" ;

`` echo "\n" ;

}

?>

Output:

[10] = Copy [9] = Reset [8] = Contribute [7] = Placement [6] = Article [5] = Report [4] = Videos [3] = Graphics [2] = GeeksforGeeks [1] = Machine [0] = Technology

Program 2:

<?php

$arr = array ( "a" => 11,

`` "b" => 22,

`` "d" => 33,

`` "n" => 44,

`` "o" => 55,

`` "p" => 66,

`` "r" => 77,

`` "s" => 2,

`` "q" => -11,

`` "t" => 3,

`` "u" => 1000,

`` "z" => 1,