PHP的foreach数组输出到表空单元格

  • Z时代
  • 2024-01-10
  • 分类：问答

我想为自己做一个简单的教学计划，并卡住我的数组的输出。PHP的foreach数组输出到表空单元格

这里的PHP：

echo '<table><thead><tr><th>Period</th><th>1</th><th>2</th><th>3</th>th>4</th><th>5</th><th>6</th><th>7</th><th>8</th><th>9</th></tr>'; 
echo '<tr><th>Time</th><th>08:50</th><th>09:40</th><th>10:30</th><th>11:20</th><th>12:10</th><th>13:00</th><th>13:50</th><th>14:40</th><th>13:30</th></tr>'; 
echo '</thead><tbody>'; 
$results = $db->mysql->query("SELECT * FROM schedule"); 
if ($results->num_rows) { 
    while ($row = $results->fetch_assoc()) { 
     $days[$row['day']][$row['period']] = $row['classroom']; 
    } // close days while 
    foreach ($days as $key => $val) { 
     echo '<tr><td>' . $key . 
      '</td>'; 
     foreach ($val as $item) { 
      echo '<td>' . $item . 
       '</td>'; 
     } 
     echo '</tr>'; 
    } 
} 
echo '</tbody></table>';

这给了我一个这样的数组：

Array 
(
[Monday] => Array 
    (
     [1] => m5 biology 
     [6] => m5 ict 
     [8] => m6 ict 
    ) 
[Tuesday] => Array 
    (
     [3] => m5 biology 
     [6] => m6 ict 
     [7] => m6 ict 
    ) 
[Wednesday] => Array 
    (
     [1] => m6 biology 
     [2] => m5 ict 
     [7] => m5 biology 
     [8] => m2 ict 
    ) 
[Thursday] => Array 
    (
     [1] => m6 biology 
    ) 
[Friday] => Array 
    (
     [1] => m6 biology 
     [6] => m6 ict 
    )

表看起来就像这样：

... 
<tr> 
    <td>Monday</td> 
    <td>m5 biology</td> 
    <td>m5 ict</td> 
    <td>m6 ict</td> 
</tr> 
...

我想是什么输出包含空闲表单元的空闲表单。在星期一的例子中，只有周期1,6,8的数据，所以它只显示那些单元格。

我怎样才能得到这段代码也输出周期为2,3,4,5,7,9的空单元？就像这样：

... 
<tr> 
    <td>Monday</td> 
    <td>m5 biology</td> 
    <td>&nbsp</td> 
    <td>&nbsp</td> 
    <td>&nbsp</td> 
    <td>&nbsp</td> 
    <td>m5 ict</td> 
    <td>&nbsp</td> 
    <td>m6 ict</td> 
    <td>&nbsp</td> 
</tr>

我想过的foreach使用if语句，但我想不通，我需要做什么样的关系。

任何援助将不胜感激。

回答：

试试这个

<?php 
$data = array (
    "Monday" => Array 
    (
     1 => "m5 biology", 
     6 => "m5 ict", 
     8 => "m6 ict", 
    ), 
    "Tuesday" => Array 
    (
     3 => "m5 biology", 
     6 => "m6 ict", 
     7 => "m6 ict", 
    ), 
    "Wednesday" => Array 
    (
     1 => "m6 biology", 
     2 => "m5 ict", 
     7 => "m5 biology", 
     8 => "m2 ict", 
    ), 
    "Thursday" => Array 
    (
     1 => "m6 biology", 
    ), 
    "Friday" => Array 
    (
     1 => "m6 biology", 
     6 => "m6 ict", 
    ) 
); 
$table = "<table border = '1'><tr><td>Day</td>"; 
for ($x = 1; $x<8; $x++) { 
    $table .= "<td>Period $x</td>"; 
} 
$table .= "</tr>"; 
foreach ($data as $day => $classes) { 
    $table .= "<tr><td>$day</td>"; 
    for ($x = 1; $x<8; $x++) { 
     if (isset($classes[$x])) { 
      $table .= "<td>" . $classes[$x] . "</td>"; 
     } else { 
      $table .= "<td></td>"; 
     } 
    } 
    $table .= "</tr>"; 
} 
$table .= "</table>"; 
echo $table;

回答：

由于您使用的数字键，你知道有一个星期只有7天，不要使用foreach（），使用for（）代替：

for($i = 1; $i <= 7; $i++) { 
    if(isset($array[$i])) { 
     ... there's info for this day, output it 
    } else { 
     ... no info, output a blank cell 
    } 
}

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