custom filter modifier doesn't work

$options = explode(",",$options);
if (in_array($input, $options)) 
    return true; 
else
    return false;

[[*id:inarray=`2,30,40,80`:then=`id in array!`:else=`id is not in array!`]]

if (in_array($input, $options)) 
    return 'yes'; 
else
    return 'no';
[[*id:inarray=`2,30,40,80`:is=`yes`:then=`id in array!`:else=`id is not in array!`]]

$options = explode(",",$options);
return intval(in_array($input, $options));

[[!MyInArray? $docIds=`2,30,40,90`]]

<?php
/* MyInArray Snippet */

$a = explode(',', $docIds);
if (in_array($modx->resource->get('id'), $a)) {
   $output = 'something';
} else {
   $output = 'something else';
}

return $output;

<?php
$docIds = explode(",",$options);
$id = $modx->resource->get('id');
if(in_array($id, $docIds)) return true;
return false;

[[*id:inarray=`2,30,40,80`:is=`1`:then=`id in array!`:else=`id is not in array!`]]

// snipped name inarray
$options = explode(",",$options);
return array ( [0] => intval(in_array($input,$options)));

using [[*id:inarray=`2,8,100,68,...`:then=`code`:else=`code`]]

 case 'then':
   var_dump($condition);
   $output = null;
     $conditional = join(' ', $condition);
     try {
        $m_con = @eval("return (" . $conditional . ");");
        $m_con = intval($m_con);
        if ($m_con) {
            $output= $m_val;
        }
    } catch (Exception $e) {}
    break;

// snippet name 'testSnippet'
.....
// for testing
return array(0=>1); // or $condition[]=1

[[+myString:testSnippet=`someValue`:then=`code1`:else=`code2`]]

case 'then':
  var_dump($condition);
  $output = null;
    $conditional = join(' ', $condition);
    try {
       $m_con = @eval("return (" . $conditional . ");");
       $m_con = intval($m_con);
       if ($m_con) {
           $output= $m_val;
       }
   } catch (Exception $e) {}
   break;

array(0){}