陣列內的多排序

Question

這是我的多排序代碼。

但是，我怎麼能爲個人coloumns

是我迄今所做的做到這一點是

PHP代碼：

<?php 
$a1=array("Cat","Alpha","two"); 
$a1=array("Cat","Beta","two"); 
$a1=array("Pluto","Beta","two"); 
$a1=array("Pluto","Alpha","two"); 
array_multisort($a1[0], SORT_ASC, SORT_STRING, $a1[1], SORT_NUMERIC, SORT_DESC); 
$json[] = $a1; 
$final=array("response"=>$a1); 
echo json_encode($final); 
?> 

它會顯示爲

Array ([0] => Cat [1] => Dog [2] => zb) Array ([0] => Missy [1] => Pluto [2] => Fido) 

我想顯示

的$首先Coloumn a1作爲ASC，那麼$二Coloumn a1作爲說明，

這樣的結果應該是

Col A Col B, Col C 
Cat, Alpha two 
Cat, Beta two 
Pluto, Alpha two 
Plugo, Beta two 

我可怎麼辦呢？

Answer 1

<?php 
$a1=array("Dog","zb","Cat"); 
$a2=array("Pluto","Fido","Missy"); 

array_multisort($a1,SORT_ASC); 
array_multisort($a2,SORT_DESC); 
print_r($a1); 
print_r($a2); 
?> 

Answer 2

我猜你想使用usort建立你自己的自定義排序算法：

<?php 
$array = array(
    array("Cat","Alpha","two"), 
    array("Cat","Beta","two"), 
    array("Pluto","Beta","two"), 
    array("Pluto","Alpha","two"), 
); 

function my_custom_sort($a, $b) 
{ 
    // first sort ASC by first column 
    if ($a[0] == $b[0]) { 
     // then sort ASC by second column 
     if ($a[1] == $b[1]) { 
      return 0; 
     } else { 
      return $a[1] < $b[1] ? -1 : 1; 
     } 
    } else { 
     return $a[0] < $b[0] ? -1 : 1; 
    } 
} 

usort($array, 'my_custom_sort'); 
var_dump($array);