php - 删除数组中的重复值

Question

我正在使用 foreach 循环来显示表中的数组值。下面是我的表格的样子。

<table>
    <thead>
       <th>Model</th>
       <th>Trim</th>
       <th>Year</th>
    </thead>
    <tbody>
     <tr>
       <td>Impreza</td>
       <td>GC</td>
       <td>1994</td>
     </tr>
     <tr>
       <td>Impreza</td>
       <td>GC</td>
       <td>1995</td>
     </tr>
     <tr>
       <td>Impreza</td>
       <td>GC</td>
       <td>1996</td>
     </tr>
     <tr>
       <td>Impreza</td>
       <td>GC-Turbo</td>
       <td>1994</td>
     </tr>
     <tr>
       <td>Impreza</td>
       <td>GC-Turbo</td>
       <td>1995</td>
     </tr>
    </tbody>
</table>

如何操作数组，从表中删除重复项或简化它？

数组值:

    Array
(
    [0] => Array
        (
            [0] => IMPREZA
            [1] => GC
            [2] => 1994
        )

    [1] => Array
        (
            [0] => IMPREZA
            [1] => GC
            [2] => 1995
        )

    [2] => Array
        (
            [0] => IMPREZA
            [1] => GC
            [2] => 1996
        )

    [3] => Array
        (
            [0] => IMPREZA
            [1] => GC-TURBO
            [2] => 1994
        )

    [4] => Array
        (
            [0] => IMPREZA
            [1] => GC-TURBO
            [2] => 1995
        )

)

在表中显示数组值

<table>
 <thead></thead>
 <tbody>
    <?php foreach ($options as $option) : ?>
     <tr>
        <?php foreach ($option as $value) : ?>
          <td><?= $value ?></td>
        <?php endforeach; ?>
      </tr>
      <?php endforeach; ?>
 </tbody>
</table>

我希望表格是这样的:我该怎么做？请不要精通 PHP。

<table>
 <thead>
    <th>Model</th>
    <th>Trim</th>
    <th>Year</th>
 </thead>
 <tbody>
  <tr>
    <td>Impreza</td>
    <td>GC</td>
    <td>1994-1996</td>
  </tr>
  <tr>
    <td>Impreza</td>
    <td>GC-Turbo</td>
    <td>1994-1995</td>
  </tr>
 </tbody>
</table>

Answer 1

作为替代方案，您可以使用Model 和Trim 的复合键，并将Year 收集到数组中。

要获取结果，请使用 array_unique与 min 结合和 max如果只有 1 年，则通过破折号进行爆炸以仅在结果中保留一年。

例如:

    $options = [
    ['IMPREZA', 'GC', 1994],
    ['IMPREZA', 'GC', 1995],
    ['IMPREZA', 'GC', 1996],
    ['IMPREZA', 'GC-TURBO', 1994],
    ['IMPREZA', 'GC-TURBO', 1995],
    ['IMPREZA', 'Test', 1998]
];

$result = [];

foreach ($options as $option) {
    $compoundKey = $option[0] . "|" . $option[1];
    isset($result[$compoundKey]) ? $result[$compoundKey][] = $option[2] : $result[$compoundKey] = [$option[2]];
}

foreach($result as $key => $value) {
    $parts = explode('|', $key);
    $parts[] = implode("-", array_unique([min($value), max($value)]));
    $result[$key] = $parts;
}

结果

Array
(
    [IMPREZA|GC] => Array
        (
            [0] => IMPREZA
            [1] => GC
            [2] => 1994-1996
        )

    [IMPREZA|GC-TURBO] => Array
        (
            [0] => IMPREZA
            [1] => GC-TURBO
            [2] => 1994-1995
        )

    [IMPREZA|Test] => Array
        (
            [0] => IMPREZA
            [1] => Test
            [2] => 1998
        )

)

Php demo

如果你想重置按键，你可以使用 array_values就像array_values($result)