Denis

function filterItems($where, $items) {

        $tempitems = array();
        foreach ($items as $item) {
            $include = true;
            foreach ($where as $key => $operand) {
                $key = explode(':', $key);
                $field = $key[0];
                $then = $include;
                $else = false;
                $subject = $item[$field];

                $operator = isset($key[1]) ? $key[1] : '=';
                $params = isset($key[2]) ? $key[2] : '';
                $operator = strtolower($operator);
                switch ($operator) {
                    case '!=':
                    case 'neq':
                    case 'not':
                    case 'isnot':
                    case 'isnt':
                    case 'unequal':
                    case 'notequal':
                        $output = (($subject != $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                    case '<':
                    case 'lt':
                    case 'less':
                    case 'lessthan':
                        $output = (($subject < $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                    case '>':
                    case 'gt':
                    case 'greater':
                    case 'greaterthan':
                        $output = (($subject > $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                    case '<=':
                    case 'lte':
                    case 'lessthanequals':
                    case 'lessthanorequalto':
                        $output = (($subject <= $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                    case '>=':
                    case 'gte':
                    case 'greaterthanequals':
                    case 'greaterthanequalto':
                        $output = (($subject >= $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                    case 'isempty':
                    case 'empty':
                        $output = empty($subject) ? $then : (isset($else) ? $else : '');
                        break;
                    case '!empty':
                    case 'notempty':
                    case 'isnotempty':
                        $output = !empty($subject) && $subject != '' ? $then : (isset($else) ? $else : '');
                        break;
                    case 'isnull':
                    case 'null':
                        $output = $subject == null || strtolower($subject) == 'null' ? $then : (isset($else) ? $else : '');
                        break;
                    case 'inarray':
                    case 'in_array':
                    case 'ia':
                    case 'in':
                        $operand = is_array($operand) ? $operand : explode(',', $operand);
                        $output = in_array($subject, $operand) ? $then : (isset($else) ? $else : '');
                        break;
                    case 'find':
                    case 'find_in_set':
                        $subject = is_array($subject) ? $subject : explode(',', $subject);
                        $output = in_array($operand, $subject) ? $then : (isset($else) ? $else : '');
                        break;
                    case 'find_pd':
                    case 'find_in_pipesdelimited_set':
                        $subject = explode('||', $subject);
                        $output = in_array($operand, $subject) ? $then : (isset($else) ? $else : '');
                        break;
                    case 'contains':
                        $output = strpos($subject, $operand) !== false ? $then : (isset($else) ? $else : '');
                        break;
                    case 'snippet':
                        $result = $this->modx->runSnippet($params, array('subject' => $subject, 'operand' => $operand));
                        $output = !empty($result) ? $then : (isset($else) ? $else : '');
                        break;
                    case '==':
                    case '=':
                    case 'eq':
                    case 'is':
                    case 'equal':
                    case 'equals':
                    case 'equalto':
                    default:
                        $output = (($subject == $operand) ? $then : (isset($else) ? $else : ''));
                        break;
                }

                $include = $output ? $output : false;

            }
            if ($include) {
                $tempitems[] = $item;
            }

        }
        return $tempitems;
    }