PHP array array element values ​​sorted in descending order rsort() function_PHP tutorial

To sort array values, in addition to the various sorting methods taught by the teacher, our PHP directly gives you a function rsort(). The usage is very simple, but it is only suitable for arrays.

rsort(array,sorttype)

Parameter Description
array required. The input array.
sorttype optional. Specifies how to arrange the values ​​of an array. Possible values:

SORT_REGULAR - Default. Processed with their original type (without changing type).
SORT_NUMERIC - treat values ​​as numbers
SORT_STRING - handle values ​​as strings
SORT_LOCALE_STRING - Handle values ​​as strings, based on local settings*.

The code is as follows

代码如下	复制代码
$my_array = array("a" => "Dog", "b" => "Cat", "c" => "Horse"); rsort($my_array); print_r($my_array); ?> 输出： Array ( [0] => Horse [1] => Dog [2] => Cat )

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代码如下

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$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);

$my_array = array("a" => "Dog", "b" => "Cat", "c" => "Horse");

rsort($my_array);

print_r($my_array);

?>

Output:

代码如下	复制代码
foreach ($data as $key => $row) {     $volume[$key]  = $row['volume'];     $edition[$key] = $row['edition']; }

Array

(
[0] => Horse
[1] => Dog
[2] => Cat

)

代码如下	复制代码
volume | edition -------+-------- 98 |       2 86 |       1 86 |       6 85 |       6 67 |       2 67 |       7

Other references

The code is as follows

Copy code $data[] = array('volume' => 67, 'edition' => 2); $data[] = array('volume' => 86, 'edition' => 1); $data[] = array('volume' => 85, 'edition' => 6); $data[] = array('volume' => 98, 'edition' => 2); $data[] = array('volume' => 86, 'edition' => 6); $data[] = array('volume' => 67, 'edition' => 7); In this example, volume will be sorted in descending order and edition will be sorted in ascending order. Now you have an array with rows, but array_multisort() requires an array with columns, so use the following code to get the columns and then sort them. //Get the list of columns

The code is as follows

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foreach ($data as $key => $row) { $volume[$key] = $row['volume']; $edition[$key] = $row['edition']; } // Sort the data in descending order according to volume and in ascending order according to edition // Use $data as the last parameter, sort by common key array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data); The data collection is now sorted, and the results are as follows:

The code is as follows

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volume | edition -------+-------- 98 | 2 86 | 1 86 | 6 85 | 6 67 | 2 67 | 7 In fact, there are many methods that can be used when sorting, such as arsort(), asort(), ksort(), krsort(), natsort(), natcasesort(), rsort that comes with PHP’s array array. (), usort(), array_multisort() and uksort(). http://www.bkjia.com/PHPjc/631308.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631308.htmlTechArticleFor sorting array values, except that I can use various sorting methods taught by the teacher, our php can directly You have a function rsort(), which is very simple to use, but it is only suitable for arrays. ...