根据数组值检查复选框？答案

【问题标题】：Checking a checkbox based on array value?根据数组值检查复选框？
【发布时间】：2012-08-22 00:21:20
【问题描述】：

我目前有两个如下所示的数组：

色板：

Array
(
    [0] => Array
        (
            [swatch_id] => 8
            [swatch_file] => orange_swatch.jpg
        )

    [1] => Array
        (
            [swatch_id] => 9
            [swatch_file] => pink_swatch.jpg
        )

    [2] => Array
        (
            [swatch_id] => 10
            [swatch_file] => green_swtach.jpg
        )

)

选定的色板：

Array
(
    [0] => Array
        (
            [swatches_has_products_id] => 18
            [swatches_swatch_id] => 8
            [products_product_id] => 19
        )

    [1] => Array
        (
            [swatches_has_products_id] => 19
            [swatches_swatch_id] => 10
            [products_product_id] => 19
        )

)

如果$swatch['swatch_id'] 等于$selected_swatches['swatches_swatch_id']，我正在尝试选中一个复选框。我正在使用以下代码执行此操作：

<?php foreach ($swatches as $k => $swatch): ?>
    <li>
        <img src="<?php echo base_url(); ?>media/images/swatches/<?php echo $swatch['swatch_file']; ?>" height=""/>
        <input type="checkbox" name="product_has_swatch[]" value="<?php echo $swatch['swatch_id']; ?>" <?php    if($swatch['swatch_id'] == $selected_swatches[$k]['swatches_swatch_id']) : ?> checked="checked" <?php endif; ?> />
    </li>
<?php endforeach; ?>

但是，如果没有匹配项，我会收到以下错误：

A PHP Error was encountered
   Severity: Notice
    Message: Undefined offset: 2
   Filename: products/create.php
Line Number: 137

第 137 行是if，用于检查我是否有匹配项；我哪里错了？

【问题讨论】：

标签： php arrays checkbox foreach

【解决方案1】：

一种解决方案是：

// make a new array of selected ids
$newArr = array();
foreach($selected_swatches as $val) {
    array_push($newArr, $val['swatches_swatch_id']);
}

// then check with in_array, like:
<?php foreach ($swatches as $k => $swatch): ?>
    <li>
        <img src="<?php echo base_url(); ?>media/images/swatches/<?php echo $swatch['swatch_file']; ?>" height=""/>
        <input type="checkbox" name="product_has_swatch[]" value="<?php echo $swatch['swatch_id']; ?>" <?php if(in_array($swatch['swatch_id'], $newArr)) : ?> checked="checked" <?php endif; ?> />
    </li>
<?php endforeach; >

希望对你有帮助

【讨论】：

【解决方案2】：

因为您在 Selected Swatches 数组中没有索引 2。这就是为什么它会通知您。

【讨论】：

【解决方案3】：

**Check this out it works fine**

$swatches           = array( 0 =>array('swatch_id'=>8,'swatch_file'=>'orange_swatch.jpg'),
                             1 => array('swatch_id'=>9,'swatch_file'=>'ping_swatch.jpg'),
                             2 =>array('swatch_id'=>10,'swatch_file'=>'green_swatch.jpg')
                           );
$selected_swatches  = array( 0 =>array('swatches_has_products_id'=>18,'swatches_swatch_id'=>8,'products_product_id'=>19),
                             1 =>array('swatches_has_products_id'=>19,'swatches_swatch_id'=>10,'products_product_id'=>19),

                            );               

foreach($swatches as $k=>$swatch) :

    ?>

<li>

 <input type="checkbox" name="product_has_swatch" value="<?php echo $swatch['swatch_id'];?>"

 <?php 
      if($swatch['swatch_id'] == $selected_swatches[$k]['swatches_swatch_id']):
              echo "checked = 'checked'";
      endif;
  ?>


 />
</li>
<?php endforeach; ?>

【讨论】：