PHP array grouping and sorting instances

This article mainly introduces an array sorting instance in PHP. For more information about how to sort arrays in PHP, see

This article mainly introduces an array sorting instance in PHP. For more information about how to sort arrays in PHP, see

PHP array. The content in the array is roughly as follows:

The Code is as follows:

$ List = array (
Array (2, 3, 5 ),
Array (2, 5, 24 ),
Array (3, 8, 6 ),
Array (3, 2, 10 ),
Array (4,7, 20 ),
Array (4,1, 15 ),
Array (6, 4, 10 ),
Array (7,9, 20 ),
);

For ease of expression, I name three columns of numbers and three columns of ABC respectively.

Requirement: columns A are sorted by default. If Column A is the same, columns C are arranged in reverse order with the same elements. Column B is not involved in sorting, but it is useful in practical use, so I also wrote it out.

Method 1:

The Code is as follows:

$ A = $ c = array ();
Foreach ($ list as $ val ){
$ A [] = $ val [0]; // column
$ C [] = $ val [2]; // column c
}
// Install column a in ascending order, and then install Column B in descending order, similar to SQL, orderby a asc, B desc
Array_multisort ($ a, SORT_ASC, $ c, SORT_DESC, $ list );
Print_r ($ list );

Method 2:

The Code is as follows:

For ($ j = 0; $ j For ($ I = count ($ list)-1; $ I> $ j; $ I --){
If ($ list [$ I] [0] = $ list [$ I-1] [0] & $ list [$ I] [2]> $ list [$ I-1] [2])
List ($ list [$ I], $ list [$ I-1]) = array ($ list [$ I-1], $ list [$ I]);
}
}