Фильтр MODX, парсит строку и выводит по шаблону: [[+placeholder:stringParser=`{ "delimiter" : ", ", "tpl" : "@inline [[+item]]" }`]]

stringParser.php

<?php
/**
 * MODX output filter
 * Parse string from [[+placeholder]] and wrap every item with tpl.
 * Parameters as JSON keys, tpl can be set as chunk name :
 * [[+placeholder:stringParser=`{ "delimiter" : ", ", "tpl" : "my_chunk`]]
 * or with @INLINE:
 * [[+placeholder:stringParser=`{ "delimiter" : ", ", "tpl" : "@INLINE [[+item]]" }`]]
 * Requrements: pdoTools.
 */ 
if(empty($input)){
  return;
}
$param = json_decode( $options, true );
$arr = array_map( "trim" , explode($param[ 'delimiter' ], $input) );
$result = '';
for( $i = 0; $i < count($arr); $i++ ){
  $result .= $modx->getService('pdoTools')->getChunk($param[ 'tpl' ], array(
    "item" => $arr[ $i ],
  ) );
}
return $result;