PHP Array Sorting _php tutorial

The order of the PHP array is actually to sort the PHP array, in this article, the result set of the database query is sorted. Database query results sometimes can not be used directly, such as MySQL with in statements out of the results, so need to sort the results in some way. It's time to sort the PHP array. To sort the results of a database, see the following example:

In this example, each cell in the data array represents a row in a table. This is a typical way of storing array data in a database.
The data in the example is as follows:
Volume | Edition
-------+--------
67 | 2
86 | 1
85 | 6
98 | 2
86 | 6
67 | 7

The data is all stored in an array named data. This is usually done by looping the results from the database, such as MYSQL_FETCH_ASSOC () (In fact this function you can see with the MYSQL_FETCH_ASSOC () function, the specific difference you can look at the PHP manual about key differences).
$data [] = array (volume = edition = 2);
$data [] = array (volume = edition = 1);
$data [] = array (volume = edition = 6);
$data [] = array (volume = 98, edition = 2);
$data [] = array (volume = edition = 6);
$data [] = array (volume = edition = 7);

In this example, the volume is sorted in descending order, and the edition in ascending order.

Now that you have an array with rows, but Array_multisort () requires an array of columns, so use the following code to get the columns and sort them.
Get a list of columns
foreach ($data as $key = = $row) {
$volume [$key] = $row [volume];
$edition [$key] = $row [edition];
}

Sort data in descending order according to volume, in ascending order of edition
The $data as the last parameter, sorted by the Universal key
Array_multisort ($volume, Sort_desc, $edition, SORT_ASC, $data);

The data set is now sorted and the results are as follows:
Volume | Edition
-------+--------
98 | 2
86 | 1
86 | 6
85 | 6
67 | 2
67 | 7

Actually there are many other ways to use it in the sort order, such as PHP's array of Arsort (), Asort (), Ksort (), Krsort (), Natsort (), Natcasesort (), Rsort (), Usort ( ), Array_multisort () and Uksort ().

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