php数组中的排序

我有一段代码，它在我的数据库中打印出列，并为我添加一列“利润”。 距离是以复杂的方式计算的，因此是在循环中完成的，而距离到“利润”的转换是在打印出来时完成的

我想做的是按“利润”的降序打印出来。我相信（但不知道）最好的方法是将它们存储在一个数组中，然后“在那里对它们进行排序”，然后从那里打印出来

如何确定要将它们放入阵列的哪一行？
如何在数组中排序？
如何循环数组，使其无法打印出来

//display results
// now we retrieve the routes from the db
$query = "SELECT * FROM routes ORDER BY `id`;";

// run the query. if it fails, display error
$result = @mysql_query("$query") or die('<p class="error">There was an unexpected error grabbing routes from the database.</p>');

?>
<tr>
   <td style="background: url(http://www.teamdelta.byethost12.com/barbg.jpg) repeat-x top;">
      <center><b><font color="#F3EC84">»Matches«</font></b></center>
   </td>
</tr>

<tr>
<td style="background: #222222;">

</font>
<table border="0" width="100%"><tr>


<td width="10%"><b><center><b>Player</b></center></b></td>
<td width="10%"><center><b>Base</b></center></td>
<td width="10%"><b>Location</b></td>
<td width="5%"><b>Econ</b></td>
<td width="10%"><b>Distance</b></td>
<td width="10%"><center><b>Profit cred./h</b></center></td>
<td width="40%"><b>Comment</b></td>
<td width="5%"><align="right"><b>Delete</b></align></td>

</tr> 

<?

// while we still have rows from the db, display them
while ($row = mysql_fetch_array($result)) {

    $dname = stripslashes($row['name']);
    $dbase = stripslashes($row['base']);
    $dlocation = stripslashes($row['location']);
    $dx = stripslashes($row['x']);
    $dy = stripslashes($row['y']);
    $dgalaxy = stripslashes($row['galaxy']);
    $dplanet = stripslashes($row['planet']);
    $dcomment = stripslashes($row['comment']);
    $did = stripslashes($row['id']);
    $decon = stripslashes($row['econ']);

    $distance = -1 ;//default

    //distance calc
    if($dgalaxy == $galaxy)
    {//interstellar
       if(($dx == $x) && ($dy == $y))
       {//inter planitary
          if ((floor($planet/10)*10) == (floor($dplanet/10)*10))
          {// intra planitary loonar
             $distance = abs(fmod($planet,10)-fmod($planet,10))*0.1;  
          }
          else
          {// inter planitary
             $distance = abs((floor($planet/10)*10)-(floor($planet/10)*10))*0.2;  
          }
       }else
       {//interstllar
          $distance = round(Sqrt(pow(($dx-$x),2)+pow(($dy-$y),2)));//interstllar
       }
    }
    else
    {//intergalatic
       if ((floor($galaxy/10)*10) == (floor($dgalaxy/10)*10)) 
       {//intra galactic cluster
          $distance = abs(($galaxy-$dgalaxy))*200;
       }     
       else
       {//inter galactic cluster
          if ($galaxy < $dgalaxy)
          {//anti clockwise inter galactic cluster
             $distance = (((9-fmod($galaxy,10))*200)+2000+(fmod($dgalaxy,10)*200));
          }
          else
          {//clockwise inter galactic cluster
             $distance = (((fmod($galaxy,10))*200)+2000+(fmod(9-$dgalaxy,10)*200));
          }
       }
    }

    echo('<tr>
    <td width=\'20px\'><center>('.$dname.')</center></td>
    <td><center>'.$dbase.'</center></td>
    <td><a href="http://delta.astroempires.com/map.aspx?loc='.$dlocation.'">'.$dlocation.'</a></td>
    <td>'.$decon.'</td><td>'.$distance.' </td>
    <td>'.round(Sqrt(min($decon,$econ))*(1+Sqrt($distance)/75+Sqrt($players)/10)).'</td>
    <td>['.$dcomment.']</td>
    <td><a href=deleterouteconfirm.php?id='.$did.'>Delete</a></td>
    </tr>');
}
?></table><!--display results table-->

//显示结果
//现在我们从数据库中检索路由
$query=“按`id`；从订单中选择*”；
//运行查询。如果失败，则显示错误
$result=@mysql\u query（$query）或die（“
从数据库获取路由时发生意外错误。
”；
?>
»匹配«
玩家
基础
位置
经济
距离
利润信用/h
评论
“.$decon.”“.$distance.”
“.round（Sqrt（最小（$decon，$econ））*（1+Sqrt（$distance）/75+Sqrt（$players）/10））。”
['.$dcomment.]
');
}
?>

您正在从MySQL获取数据。为什么不直接从查询中对结果进行排序

$query = "SELECT * FROM routes ORDER BY `profit` DESC, `id`;";

编辑：重新阅读您的问题，利润不是一个字段，但您可能希望用利润值填充表格，而不是每次重新计算利润值

编辑2:或者，确保您的输出，计算您的利润，将所有内容放入一个数组中，然后使用以下命令：

$resultArray; //Your array with all your rows plus a profit key-value pair.

$sortedArray = array_msort($resultArray, array('profit'=>SORT_DESC));

// array_msort by cagret at gmail dot com
function array_msort($array, $cols)
{
    $colarr = array();
    foreach ($cols as $col => $order) {
        $colarr[$col] = array();
        foreach ($array as $k => $row) { $colarr[$col]['_'.$k] = strtolower($row[$col]); }
    }
    $params = array();
    foreach ($cols as $col => $order) {
        $params[] =& $colarr[$col];
        $params = array_merge($params, (array)$order);
    }
    call_user_func_array('array_multisort', $params);
    $ret = array();
    $keys = array();
    $first = true;
    foreach ($colarr as $col => $arr) {
        foreach ($arr as $k => $v) {
            if ($first) { $keys[$k] = substr($k,1); }
            $k = $keys[$k];
            if (!isset($ret[$k])) $ret[$k] = $array[$k];
            $ret[$k][$col] = $array[$k][$col];
        }
        $first = false;
    }
    return $ret;

}

---

我认为最容易实现的解决方案是对数据库结果进行双重传递

第一步是为每一行生成“距离”和“利润”值，并将这些行存储到我们将要排序的数组中

第二个过程只需在第一个过程中创建的数组上循环，并在正确排序和转义以供输出后显示它们

<?php
//display results
// now we retrieve the routes from the db
$query = "SELECT * FROM routes ORDER BY `id`;";

// run the query. if it fails, display error
$result = @mysql_query( "$query" ) or die( '<p class="error">There was an unexpected error grabbing routes from the database.</p>' );

?>
<tr>
    <td
        style="background: url(http://www.teamdelta.byethost12.com/barbg.jpg) repeat-x top;">
    <center><b><font color="#F3EC84">»Matches«</font></b></center>
    </td>
</tr>

<tr>
    <td style="background: #222222;"></font>
    <table border="0" width="100%">
        <tr>


            <td width="10%"><b>
            <center><b>Player</b></center>
            </b></td>
            <td width="10%">
            <center><b>Base</b></center>
            </td>
            <td width="10%"><b>Location</b></td>
            <td width="5%"><b>Econ</b></td>
            <td width="10%"><b>Distance</b></td>
            <td width="10%">
            <center><b>Profit cred./h</b></center>
            </td>
            <td width="40%"><b>Comment</b></td>
            <td width="5%"><align="right"><b>Delete</b></align></td>

        </tr> 

<?

// while we still have rows from the db, display them
$resultSet = array();
while ( $row = mysql_fetch_array( $result ) )
{

  $dname = stripslashes( $row['name'] );
  $dbase = stripslashes( $row['base'] );
  $dlocation = stripslashes( $row['location'] );
  $dx = stripslashes( $row['x'] );
  $dy = stripslashes( $row['y'] );
  $dgalaxy = stripslashes( $row['galaxy'] );
  $dplanet = stripslashes( $row['planet'] );
  $dcomment = stripslashes( $row['comment'] );
  $did = stripslashes( $row['id'] );
  $decon = stripslashes( $row['econ'] );

  $distance = -1; //default


  //distance calc
  if ( $dgalaxy == $galaxy )
  { //interstellar
    if ( ( $dx == $x ) && ( $dy == $y ) )
    { //inter planitary
      if ( ( floor( $planet / 10 ) * 10 ) == ( floor( $dplanet / 10 ) * 10 ) )
      { // intra planitary loonar
        $distance = abs( fmod( $planet, 10 ) - fmod( $planet, 10 ) ) * 0.1;
      } else
      { // inter planitary
        $distance = abs( ( floor( $planet / 10 ) * 10 ) - ( floor( $planet / 10 ) * 10 ) ) * 0.2;
      }
    } else
    { //interstllar
      $distance = round( Sqrt( pow( ( $dx - $x ), 2 ) + pow( ( $dy - $y ), 2 ) ) ); //interstllar
    }
  } else
  { //intergalatic
    if ( ( floor( $galaxy / 10 ) * 10 ) == ( floor( $dgalaxy / 10 ) * 10 ) )
    { //intra galactic cluster
      $distance = abs( ( $galaxy - $dgalaxy ) ) * 200;
    } else
    { //inter galactic cluster
      if ( $galaxy < $dgalaxy )
      { //anti clockwise inter galactic cluster
        $distance = ( ( ( 9 - fmod( $galaxy, 10 ) ) * 200 ) + 2000 + ( fmod( $dgalaxy, 10 ) * 200 ) );
      } else
      { //clockwise inter galactic cluster
        $distance = ( ( ( fmod( $galaxy, 10 ) ) * 200 ) + 2000 + ( fmod( 9 - $dgalaxy, 10 ) * 200 ) );
      }
    }
  }
  $row['distance'] = $distance;
  $row['profit'] = round( Sqrt( min( $decon, $econ ) ) * ( 1 + Sqrt( $distance ) / 75 + Sqrt( $players ) / 10 ) );
  $resultSet[] = $row;
}

//  Perform custom sort
usort( $resultSet, 'sorter' );
function sorter( $a, $b )
{
  if ( $a['profit'] == $b['profit'] ) return 0;
  return ( $a['profit'] < $b['profit'] ) ? -1 : 1;
}

//  Switch to "descending"
array_reverse( $resultSet );

//  Output escape the values
$safeForHtml = array_map( 'htmlspecialchars', $resultSet );

foreach( $safeForHtml as $row )
{
  echo ( '<tr>
                <td width=\'20px\'><center>(' . $row['name'] . ')</center></td>
                <td><center>' . $row['base'] . '</center></td>
                <td><a href="http://delta.astroempires.com/map.aspx?loc=' . $row['location'] . '">' . $row['location'] . '</a></td>
                <td>' . $row['econ'] . '</td>
                <td>' . $row['distance'] . ' </td>
                <td>' . $row['profit'] . '</td>
                <td>[' . $row['comment'] . ']</td>
                <td><a href=deleterouteconfirm.php?id=' . $row['id'] . '>Delete</a></td>
                </tr>' );
}
?>
</table>
    <!--display results table-->

---

我认为在代码中计算利润之前，他不知道利润：
round（Sqrt（min（$decon，$econ））*（1+Sqrt（$distance）/75+Sqrt（$players）/10）
感谢您将其全部输入，但它似乎不起作用，它在正确的时间内循环最终输出，但打印空白..在这里使用它将D03:53:32:21作为位置，将econ作为数字其他可以是随机字符串注释，播放器是可选的。我发现了问题。我删掉了“$safeForHtml=array_map（'htmlspecialchars'，$resultSet）；”并从$resultSet打印并打印…但没有顺序…确定更改了排序器并删除了数组反转及其工作：）谢谢