如何使用PHP从多个列中选择最小值 [英] How to Select Smallest Value From Multiple Columns with PHP

问题描述

我有一个包含以下内容的表:

I have a table with the following:

    6xx     8xx      9xx     11xx      12xx
  1  0.01    0.002    0.004   0.001     0.025
  2  0.025   0.125    0.002   0.01      0.011

我想从该列中找到最小值"，使该列为绿色.

I would like to find the Smallest Value from the column make that column to be green color.

例如，在第一个中，最小值是0.001，所以我希望它是绿色；第二个，在0.002中，最小值是我希望它是绿色.

For example in 1st the smallest value is 0.001 so i want it to be green color, for second 0.002 is smallest value i want it to be green color.

有谁能指导我做到这一点，谢谢

can any one guide me how to make this ,thanks

下面的代码是我如何从数据库中选择它并在表中显示int的代码

below is the code how i selecting it from database and displaying int in a table

<?php

$dbHost = 'localhost'; // usually localhost
$dbUsername = 'xxxx';
$dbPassword = 'xxxx';
$dbDatabase = 'xxxx';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword) or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db) or die ("Could not select database.");



$ColumnNames = mysql_query("SELECT column_name 
                              FROM information_schema.COLUMNS 
                             WHERE table_name = 'supplierprice' 
                               AND column_name NOT IN ('supp_price_id',
                                                       'region',
                                                       'country',
                                                       'net_id',
                                                       'networkname', 
                                                       'mcc', 
                                                       'mnc', 
                                                       'mnp')")
                or die("mysql error"); 

$columnArray=array();
$i=0;
while($rows=mysql_fetch_array($ColumnNames))
{

$columnArray[]=$rows[0];

echo "<th style='width:67px;' class='. $columnArray[$i] .' >" . $columnArray[$i] . " 
            </th>";
$i++;
}

?>

foreach($columnArray as $value) {


//$columnArray[]=$rows1[0];

echo '<td style="width:67px;font-weight:'.$text.'" id="CPH_GridView1_xxx" width="0px;" class="'.$value.' '.$rows["net_id"].'"><p>'.$rows[$value].'</p></td>';   
}

推荐答案

不确定您的要求.您似乎正在获取表的某些列名称.我假设您想获取这些列的值并将其显示在表格中，突出显示具有最低值的列.

Not entirely sure on your requirements. You appear to be getting some column names for a table. I presume that you want to get the values of these columns and display them in a table, highlighting the one with the lowest value.

如果是这样的话.获取列，循环遍历一次以显示标题.然后，对于每一行，它调用一个带有显示它们的函数.找到最低值的键(如果2个键共享最低值，则使用最低键).它在返回的列周围循环并回显它们，以最低列的样式显示 color:#ff0000; .

If some something like this. Gets the columns, loops through them once to display the headings. For each row it then calls a function with displays them. The key of the lowest value is found (if 2 keys share the lowest value then the lowest key is used). It loops around the columns returned and echos them out, putting out a color:#ff0000; in the style for the lowest value column.

<?php

$dbHost = 'localhost'; // usually localhost
$dbUsername = 'xxxx';
$dbPassword = 'xxxx';
$dbDatabase = 'xxxx';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword) or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db) or die ("Could not select database.");

$ColumnNames = mysql_query("SELECT GROUP_CONCAT(CONCAT('`', column_name, '`')) AS some_columns
                              FROM information_schema.COLUMNS 
                             WHERE table_name = 'supplierprice' 
                               AND column_name NOT IN ('supp_price_id',
                                                       'region',
                                                       'country',
                                                       'net_id',
                                                       'networkname', 
                                                       'mcc', 
                                                       'mnc', 
                                                       'mnp')")
                or die("mysql error"); 

if($rows=mysql_fetch_array($ColumnNames))
{
    $sql = "SELECT ".$row['some_columns']." FROM supplierprice";
    $query_values = mysql_query($sql);
    if($rows2=mysql_fetch_assoc($ColumnNames))
    {
        echo "<tr>";
        foreach($rows2 AS $key=>$value)
        {
            echo "<th style='width:67px;' >".$key." </th>";
        }
        echo "</tr>";
        process_row($rows2);
        while($rows2=mysql_fetch_assoc($ColumnNames))
        {
            process_row($rows2);
        }
    }
}

function process_row($in_row)
{
    $lowest_values_key = min(array_keys($in_row, min($in_row)));  
    echo "<tr>";
    foreach($in_row AS $key=>$value)
    {
        echo "<td style='width:67px;".(($lowest_values_key == $key) ? 'color:#ff0000;' : '' )."' >".$value." </th>";
    }
    echo "</tr>";
}

?>

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