为什么我的PHP多维数组无法正常工作？

Question

我的多维数组正在运行。但是，在通过explode

进行调用时，似乎无法使用in_array或$_GET来限制数组

<?
$shop = array(
array("red", "black", "blue", "green"),
array("orange"),
array("orange", "black"),
array("pink", "yellow")
);

foreach ($shop as $rowNumber => $row)
{
    echo "<li><b>The row number $rowNumber</b>";
        echo "<ul>";
        foreach ($row as $col) {
            if (in_array($col, explode(' and ', $_GET['filter']))){
                echo "<li>".$col."</li>";
            }
        }
        echo "</ul>";
    echo "</li>";
}

?>

如果我用$_GET["filter"]=="black"运行脚本，它会显示所有项目 - 它应该只显示两个，例如这是错误的：其他行不应出现：

应该是这个

Answer 1

更新

解决方案1 ​​

   <?

    $shop = array(
    array("1", "red", "black", "blue and green"),
    array("2", "orange"),
    array("3", "pink", "yellow", "blue and green")
    );

    for ($row = 0; $row < count($shop); $row++)    
     {

            $lis = "";
            for ($col = 0; $col < count($shop[$row]); $col++)
                {
                     if (in_array($shop[$row][$col], explode(' and ', $_GET['filter'])) 
                        || empty($_GET['filter'])){
                        $lis .= "<li>".$col."</li>";
                     }
                }
           if($lis != "") {
             echo "<li><b>The row number $row</b>";
             echo "<ul>";
             echo $lis;
             echo "</ul>";
             echo "</li>";
         }
    }

    ?>

解决方案2

<?

$shop = array(
array("1", "red", "black", "blue and green"),
array("2", "orange"),
array("3", "pink", "yellow", "blue and green")
);

for ($row = 0; $row < count($shop); $row++)    
{
    $lis = "";

    for ($col = 0; $col < count($shop[$row]); $col++)
    {
            if (in_array($shop[$row][$col], explode(' and ', $_GET['filter']))){
                $lis .= "<li>".$col."</li>";
            }
    }

    if($lis=="") {

            echo "$row";

    } else {

            echo $lis;

    }
}

?>

Answer 2

你的col-Variable包含一个数字（1,2或3）但是explode-call返回一个包含单词的数组（绿色，蓝色，橙色）

即使PHP可以处理从1到“1”的强制转换，它也不能从1转换为“绿色”。

Answer 3

Just Gussing也许你想打印像这样的东西

$shop = array(array("1","red","black","blue and green"),array("2","orange"),array("3","pink","yellow","blue and green"));

echo "<ul>";
foreach ( $shop as $info ) {
    $info = array_pad($info, 4, "none");
    list($id, $color1, $color2, $mixed) = $info;
    printf("<li><b>The row number = %d , Color = 1  %s , Color 2 =   %s , Mixed  = %s </b></li>", $id, $color1, $color2, $mixed);
}
echo "</ul>";

输出

    
• 行号= 1，颜色= 1红色，颜色2 =黑色，混合=             蓝色和绿色
    
• 行号= 2，颜色= 1橙色，颜色2 =无，混合=             没有
    
• 行号= 3，颜色= 1粉红色，颜色2 =黄色，混合=             蓝色和绿色

Answer 4

我认为你可以做这样的事情：

<?
$shop = array(
array("red", "black", "blue", "green"),
array("orange"),
array("orange", "black"),
array("pink", "yellow")
);

foreach ($shop as $rowNumber => $row)
{
    echo "<li><b>The row number $rowNumber</b>";
    echo "<ul>";
    foreach ($row as $col)
    {
        //Compare both values, if they match, it prints
        if ($col == $_GET['filter'])
        {
             echo "<li>".$col."</li>";
        }
    }
    echo "</ul>";
    echo "</li>";
}

?>