Question

我有一个简单的问题。我一直试图在此代码中显示类别编号（或此处的列号）。

$cat[1] = ["A"];
$cat[2] = ["B"];


 while($row = $result->fetch_assoc())  {


    $columns[1] = array_filter($row, function($col) use ($cat) {
        if(in_array($col, $cat[1])) {  
            return true;
        }
    });


    $columns[2] = array_filter($row, function($col) use ($cat) {
        if(in_array($col, $cat[2])) {  
            return true;
        }
    });


  $output[] = $columns;   
}

$table = <<<EOT
<table>
<tr>
<th>R1</th>
<th>R2</th>
</tr>
EOT;


foreach($output as $row) {
    $table.="<tr>";
    foreach($row as $column) {
        $table .="<td>";
        $values =   // count($column); // this is  where I need help.
        $table .= $values;
        $table .="</td>";
    }

    $table.="</tr>";

}
$table.="</table>";
echo $table;

我在这里需要帮助：$values = count($column);我想不通正确的功能。如果不为空，我需要显示类别（列）号，而不是计算类别的内容。

Answer 1

我认为您在代码中所需要做的就是获取数组元素的键。

foreach ($output as $row) {
    $table .= "<tr>";

    // Add $key => here VVV
    foreach ($row as $key => $column) {
        $table .= "<td>";
        $values = $key;  // Because you only have 2 keys in your array this should be 1 or 2
        $table .= $values;
        $table .= "</td>";
    }

    $table .= "</tr>";
}

显示类别编号（或列号）

1 个答案: