Question

目前我正在尝试根据每个项目的值来排序我的数组。现在它应该从上到下排序如下：“Platinum”，“Gold”，“Silver”，“Bronze”，“None”，“完成”，“未完成”。现在问题出在运行usort（）之后函数它使数组的大小加倍。我使用的代码是：

$query = "SELECT * FROM postallions WHERE userid = :userid";
$params = array(':userid' => $userid);
try{
    $stmt = $connection->prepare($query);
    $result = $stmt->execute($params);
}
catch(PDOException $ex){
    echo ("Failed to run query: " . $ex->getMessage());
}
$columns = $stmt->fetch();

$postallionlist = $columns;
unset($postallionlist["userid"]);

print_r($postallionlist);
var_dump($postallionlist);

function compareMedals( $a, $b ) {
    $aMap = array(0 => 'None', 1 => 'Bronze', 2 => 'Silver', 3 => 'Gold', 4 => 'Platinum', 5 => 'Uncomplete', 6 => 'Complete');
    $aValues = array( 0, 1, 2, 3, 4, 5, 6);
    $a = str_ireplace($aMap, $aValues, $a);
    $b = str_ireplace($aMap, $aValues, $b);
    return $a - $b;
}
usort($postallionlist, 'compareMedals');

print_r($postallionlist);
var_dump($postallionlist);

现在当我在输出函数之前var_dump数组时：

array (size=22)
  'userid' => string '1' (length=1)
  0 => string '1' (length=1)
  'p1' => string 'Silver' (length=6)
  1 => string 'Silver' (length=6)
  'p2' => string 'Platinum' (length=8)
  2 => string 'Platinum' (length=8)
  'p3' => string 'None' (length=4)
  3 => string 'None' (length=4)
  'p4' => string 'None' (length=4)
  4 => string 'None' (length=4)
  'p5' => string 'Bronze' (length=6)
  5 => string 'Bronze' (length=6)
  'p6' => string 'Gold' (length=4)
  6 => string 'Gold' (length=4)
  'p7' => string 'Complete' (length=8)
  7 => string 'Complete' (length=8)
  'p8' => string 'None' (length=4)
  8 => string 'None' (length=4)
  'p9' => string 'None' (length=4)
  9 => string 'None' (length=4)
  'p10' => string 'None' (length=4)
  10 => string 'None' (length=4)

并且print_r：

Array ( [userid] => 1 [0] => 1 [p1] => Silver [1] => Silver [p2] => Platinum [2] => Platinum [p3] => None [3] => None [p4] => None [4] => None [p5] => Bronze [5] => Bronze [p6] => Gold [6] => Gold [p7] => Complete [7] => Complete [p8] => None [8] => None [p9] => None [9] => None [p10] => None [10] => None )

那些阵列都很完美。现在在函数之后它输出以下内容：（var_dump then print_r）

array (size=22)
  0 => string 'None' (length=4)
  1 => string 'None' (length=4)
  2 => string 'None' (length=4)
  3 => string 'None' (length=4)
  4 => string 'None' (length=4)
  5 => string 'None' (length=4)
  6 => string 'None' (length=4)
  7 => string 'None' (length=4)
  8 => string 'None' (length=4)
  9 => string 'None' (length=4)
  10 => string 'Bronze' (length=6)
  11 => string 'Bronze' (length=6)
  12 => string '1' (length=1)
  13 => string '1' (length=1)
  14 => string 'Silver' (length=6)
  15 => string 'Silver' (length=6)
  16 => string 'Gold' (length=4)
  17 => string 'Gold' (length=4)
  18 => string 'Platinum' (length=8)
  19 => string 'Platinum' (length=8)
  20 => string 'Complete' (length=8)
  21 => string 'Complete' (length=8)

Array ( [0] => None [1] => None [2] => None [3] => None [4] => None [5] => None [6] => None [7] => None [8] => None [9] => None [10] => Bronze [11] => Bronze [12] => 1 [13] => 1 [14] => Silver [15] => Silver [16] => Gold [17] => Gold [18] => Platinum [19] => Platinum [20] => Complete [21] => Complete )

那么为什么数组会在函数后加倍？

某些订单PHP中的订单数组

0 个答案: