Question

I currently have two arrays that look like this:

Swatches:

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
        )

)

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
        )

)

I am trying to check a check box if $swatch['swatch_id'] is equal to $selected_swatches['swatches_swatch_id']. I am doing this with the following code:

<?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; ?>

However I get the following error, if there are no matches:

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

Line 137 is the if to check if I have matches; Where am I going wrong?

Answer 1

One solution is:

// 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; >

Hope it helps