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<?php
// Options
$limit = (int) $modx->getOption('limit', $scriptProperties, 3, true); 
// $limit must be > 0
$limit = ($limit === 0) ? 1 : abs($limit);
$tpl = $modx->getOption('tpl', $scriptProperties, '');
if (empty($tpl)) return; // if empty what's the point?
$outputSeparator = $modx->getOption('outputSeparator', $scriptProperties, '');
$delim = $modx->getOption('delimiter', $scriptProperties, ',', true);

// Process properties
$placeholders = array_diff_key($scriptProperties, array(
    'limit' => '',
    'tpl' => '',
    'outputSeparator' => '',
    'delimiter' => '',
));
foreach ($placeholders as $key => $val) {
    $placeholders[$key] = array_map('trim', explode($delim, $val));
    $placeholders[$key] = array_pad($placeholders[$key], $limit, $placeholders[$key][0]);
}

// Populate virtual items
$items = array();
for ($idx = 0; $idx < $limit; $idx++) {
    foreach ($placeholders as $k => $v) {
        $items[$idx][$k] = $v[$idx];
    }
    $items[$idx]['idx'] = $idx;
}

// Temporary chunk
$uniqid = uniqid();
$chunk = $modx->newObject('modChunk', array('name' => "{tmp}-{$uniqid}"));
$chunk->setCacheable(false);

// Output
$output = array();
foreach ($items as $item) {
    $output[] = $chunk->process($item, $tpl);
}
return implode($outputSeparator, $output);