PHP my_asort()和my_ksort()

Question

我正在处理这个在php中排序的问题。我必须编写自己的排序函数，使用my_asort()和my_ksort()函数，它们分别执行与asort和ksort完全相同的操作。但是，我无法获得正确的输出(我是对php的新手)，因此，任何帮助如何纠正这一点，将是非常感谢的。

这是我输入的代码：

<?php


echo "Original Array<br><br>";
$member = array("Jack" => "55kg", "Bill" => "35kg", "Aaron" => "60kg", "Daniel" => "80kg" );



foreach ($member as $user => $weight) {
echo "$user = $weight <br>";
}

echo "<br><br>";

function my_asort($member)
    {
    $keys=array_keys($member);
    sort($keys);
    foreach($keys as $key)
        {
        $val=$member[$key];
        unset($member[$key]);
        $member[$key]=$val;
        }
    }

echo "Sorted By user <br><br>";
foreach ($member as $user => $weight) {
echo "$user = $weight <br>";
}

echo "<br><br>";

function my_ksort($member)
    {
    $keys=array_keys($member);
    sort($keys);
    foreach($keys as $key)
        {
        $val=$member[$key];
        unset($member[$key]);
        $member[$key]=$val;
        }
    }

echo "Sorted By weight <br><br>";
foreach ($member as $user => $weight) {
echo "$user = $weight <br>";
}

?>

这就是它显示的内容：(它不做任何排序，我做错了什么？)

Original Array

Jack = 55kg 
Bill = 35kg 
Aaron = 60kg 
Daniel = 80kg 


Sorted By user 

Jack = 55kg 
Bill = 35kg 
Aaron = 60kg 
Daniel = 80kg 

Sorted By weight 

Jack = 55kg 
Bill = 35kg 
Aaron = 60kg 
Daniel = 80kg

Answer 1

您需要调用您的函数(或者使用没有函数声明的代码)。你只是在你的代码中定义了它们。

因此，如果您想使用它们，您需要调用它们，您的代码如下所示：

<?php

function my_ksort(&$member)
{
  $keys=array_keys($member);
  sort($keys);
  foreach($keys as $key)
  {
    $val=$member[$key];
    unset($member[$key]);
    $member[$key]=$val;
  }
}

function my_asort(&$member)
{
  $keys=array_keys($member);
  sort($keys);
  foreach($keys as $key)
  {
    $val=$member[$key];
    unset($member[$key]);
    $member[$key]=$val;
  }
}    

echo "Original Array<br><br>";
$member = array("Jack" => "55kg", "Bill" => "35kg", "Aaron" => "60kg", "Daniel" => "80kg" );
foreach ($member as $user => $weight) { 
  echo "$user = $weight <br>";
}

echo "<br><br>";

my_asort($member);
echo "Sorted By user <br><br>";
foreach ($member as $user => $weight) {
  echo "$user = $weight <br>";
}

echo "<br><br>";

my_ksort($member);
echo "Sorted By weight <br><br>";
foreach ($member as $user => $weight) {
  echo "$user = $weight <br>";
}

Answer 2

两个问题：

您没有使用您创建的函数：

my_asort($member);
my_ksort($member);

而且您必须在参数中对数组添加一个引用(&)，因为除了修改数组之外，什么都不返回：

function my_asort(&$member)
function my_ksort(&$member)

(我没有检查结果是否与实际的asort和ksort函数相对应，但由于它看起来像是学校的作业，我相信您现在已经得到了函数的输出。)

Answer 3

代码中的任何地方都没有调用方法。您只是提供了方法定义，但没有调用。