PHP user-defined functions generate Cartesian product

: This article mainly introduces PHP user-defined functions to generate Cartesian products. For more information about PHP tutorials, see.

 "; Print_r (combineDika ($ color, $ size, $ local);/*** Cartesian product of all arrays ** @ param unknown_type $ data */function combineDika () {$ data = func_get_args (); $ cnt = count ($ data); $ result = array (); foreach ($ data [0] as $ item) {$ result [] = array ($ item) ;}for ($ I = 1; $ I <$ cnt; $ I ++) {$ result = combineArray ($ result, $ data [$ I]);} return $ result;}/*** Cartesian product of two arrays ** @ param unknown_type $ arr1 * @ param unknown_type $ arr2 */f Unction combineArray ($ arr1, $ arr2) {$ result = array (); foreach ($ arr1 as $ item1) {foreach ($ arr2 as $ item2) {$ temp = $ item1; $ temp [] = $ item2; $ result [] = $ temp;} return $ result ;}?>

Running result:

Array(    [0] => Array        (            [0] => red            [1] => 39            [2] => beijing        )    [1] => Array        (            [0] => red            [1] => 39            [2] => shanghai        )    [2] => Array        (            [0] => red            [1] => 40            [2] => beijing        )    [3] => Array        (            [0] => red            [1] => 40            [2] => shanghai        )    [4] => Array        (            [0] => red            [1] => 41            [2] => beijing        )    [5] => Array        (            [0] => red            [1] => 41            [2] => shanghai        )    [6] => Array        (            [0] => green            [1] => 39            [2] => beijing        )    [7] => Array        (            [0] => green            [1] => 39            [2] => shanghai        )    [8] => Array        (            [0] => green            [1] => 40            [2] => beijing        )    [9] => Array        (            [0] => green            [1] => 40            [2] => shanghai        )    [10] => Array        (            [0] => green            [1] => 41            [2] => beijing        )    [11] => Array        (            [0] => green            [1] => 41            [2] => shanghai        ))

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