PHP array grouping and sorting instance code

PHP array grouping and sorting instance code

The PHP array contains the following content: $ 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 the three columns of numbers respectively. The ABC column needs to be sorted by column A by default. If column A is the same, the C column sorts the same elements in inverted order. Column B is not involved in sorting, but it is useful in practical use, so it is also written. Method 1: $ 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: 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]); } }