Answered Issue with checking more than one checkboxes

<div>[[+total]] Products</div>
<form action="[[~[[*id]]]]" method="POST">
<p>Choose a Group or Groups:</p>
<div id="check">
   <input type="checkbox" name="group[]" id="check1" value="BRA" />
   <label for="check1">Brackets</label> 
   <input type="checkbox" name="group[]" id="check2" value="BLK" />
   <label for="check2">Blocks</label> 
   <input type="checkbox" name="group[]" id="check3" value="COR" />
   <label for="check3">Corbels</label> 
   <input type="checkbox" name="group[]" id="check4" value="GBR" />
   <label for="check4">Gingerbreads</label>
   <input type="submit" name="submit" Value="Submit"/>
</div>
</form>

<?php
$output = "";

$path = MODX_CORE_PATH . 'components/aeibbproducts/';
$result = $modx->addPackage('aeibbproducts',$path .
    'model/','aei_');

if (! $result) {
    return 'failed to add package';
}

if (isset($_POST['group']) && (! empty($_POST['group']))) {
    $group = $_POST['group'];
}

$c = $modx->newQuery('BbProducts');

foreach($group as $selected) {
$c->where(array('pre' => $selected));
}

$total = $modx->getCount('BbProducts',$c);
$totalVar = $modx->getOption('totalVar', $scriptProperties, 'total');
$modx->setPlaceholder($totalVar,$total);

$modx->runSnippet('FeetInch');
$fi = new FeetInch($modx);

$noImage ='assets/media/jpgs/noimage-s.jpg';
$products = $modx->getCollection('BbProducts',$c);
foreach($products as $product) {
    $fields = $product->toArray();
    $width = $product->get('width');
    $fields['nwW'] = 'Width: ' . $fi->dec2inch($width);
    $height = $product->get('height');
    $fields['nwH'] = 'Height: ' . $fi->dec2inch($height);
    $proj = $product->get('proj');
    $fields['nwP'] = 'Proj: ' . $fi->dec2inch($proj);
    $pitch = $product->get('pitch');
    $fields['nwPi'] = $pitch . ' Pitch';
    $fleName = $product->get('aei');
    $temp = 'assets/media/jpgs/prod-s/' . '01-' . $fleName . '.jpg';
    $fields['imgLink'] = file_exists($temp) ? $temp : $noImage;
    $output .= $modx->getChunk('showBrackets', $fields);
}
return $output;

$i = 0
foreach($group as $selected) {
    $condition = ($i) ? 'OR:' : '';
    $c->where(array($condition.'pre' => $selected));
    $i++;
}

if (isset($_POST['group']) && (! empty($_POST['group']))) {
    $group = $_POST['group'];
} else {
    $group = array();
}

$group = array();

$group = array();
if (isset($_POST['group']) && (! empty($_POST['group']))) {
    $group = $_POST['group'];
}