Tác dụng của hàm rsort()
The rsort() function sorts the values of the indexed array in descending order.
The following table summarizes the technical details of this function.
| Return Value: | Returns TRUE on success or FALSE on failure. |
|---|---|
| Version: | PHP 4+ |
Syntax
The basic syntax of the rsort() function is given with:
rsort(array, sort_flags);
The following example shows the rsort() function in action.
Example
Run this code »<?php
// Sample array
$fruits = array("apple", "orange", "mango", "banana", "kiwi");
// Sorting the fruits array alphabetically in descending order
rsort($fruits);
print_r($fruits);
?>Tip: The counterpart of the rsort() function is the sort() function, which is used for sorting the values of the indexed array alphabetically or numerically in ascending order.
Parameters
The rsort() function accepts the following parameters.
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to sort. |
| sort_flags |
Optional. Specifies how array items should be compared. Possible values are:
|
More Examples
Here're some more examples showing how rsort() function actually works:
The following example sorts an indexed array having numeric values in descending order:
Example
Run this code »<?php
// Sample array
$numbers = array(2, 5, 10, 8, 15, 13, 20);
// Sorting the numbers array numerically in descending order
rsort($numbers);
print_r($numbers);
?>