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PHP rsort() Function

PHP rsort() Function

The rsort () function in PHP is used to sort an array in reverse order i.e., highest to lowest.

Syntax

rsort ( array &$array [, int $sort_flags = SORT_REGULAR ] )

Parameter

array(required)- This parameter represents the input array.

sort_flags (optional)- This parameter is used to modify the behavior of the sort. The various possible values for sorting type flags are as follows:

  • SORT_REGULAR (default) – It is used to compare items normally (don't change types)
  • SORT_NUMERIC – This flag is used to compare the items numerically.
  • SORT_STRING – It compares the given items as strings.
  • SORT_LOCALE_STRING – This flag compares the items as strings, based on the current locale.
  • SORT_NATURAL – It is used to compare items as strings using "natural ordering" like natsort().
  • SORT_FLAG_CASE – It can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort the given strings case-insensitively

 Return

This parameter returns a Boolean value TRUE on success or FALSE on failure.

Example 1

"Reema",2=>"Varun",1=>"Joe",4=>"Ron",3=>"Jai");
//original array
echo("Original array: \n");
print_r($array);
//sorting the array from in reverse order from highest to lowest
rsort($array);
//printing the sorted array
echo("\nSorted array: \n");
print_r($array);
?>

Output

Original array: 
 Array
 (
     [5] => Reema
     [2] => Varun
     [1] => Joe
     [4] => Ron
     [3] => Jai
 ) 
 Sorted array: 
 Array
 (
     [0] => Varun
     [1] => Ron
     [2] => Reema
     [3] => Joe 
     [4] => Jai
 )

Example 2

"Reema", "Age"=>23,"Country"=>"India");
 //original array
 echo("Original array: \n");
 print_r($array);
 //sorting the array in reverse order
 rsort($array );
 //printing the sorted array 
 echo("\nSorted array without second parameter: \n");
 print_r($array);
 //sorting array with second parameter as SORT_STRING 
 rsort($array,SORT_STRING  );
 //printing the sorted array
 echo("\nSorted array with second parameter: \n"); 
 print_r($array);
 ?>

Output

Original array: 
 Array
 (
     [Name] => Reema
     [Age] => 23
     [Country] => India
 )
 Sorted array without second parameter:  
 Array
 (
     [0] => 23
     [1] => Reema
     [2] => India
 )
 Sorted array with second parameter:  
 Array
 (
     [0] => Reema
     [1] => India
     [2] => 23
 )

Example 3

 array(1 => "mango", 2 => "banana", 2 => "apple"),
     "numbers" => array(1, 2, 3, 4, 5, 6),
     "values"   => array("first", 5 => "second", "third")
 );
 //sorting the array in reverse order
 rsort($array);
 //printing the reversed array 
 print_r($array);
 ?>

Output

Array
 (
     [0] => Array
         (
             [0] => 1
             [1] => 2
             [2] => 3
             [3] => 4
             [4] => 5 
             [5] => 6
         )
     [1] => Array
         (
             [0] => first
             [5] => second
             [6] => third 
         )
     [2] => Array
         (
             [1] => mango
             [2] => apple
         )
 )

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