php - Error in my PDO execute function -

i have following query:

select case when card_type='a'  name else  concat_ws(' ',firstname,lastname)  end                       cname ,cardid,card_type,isdeck,userid_from,status,cards.gibid,message ,userid_to,description,tagline,gibs.preview_thumb                     ,case when  userid_from=userid_to 'my card ' else 'other 'end owner              cards left join gibs on gibs.gibid=cards.gibid                 left join users on users.userid=cards.userid_from             userid_to=? , cards.deleted='n'  , (case when card_type='a'  name else  concat_ws(' ',firstname,lastname)  end)  '%?%'             order status,card_type desc,owner,cname,isdeck desc 

and array passed in execute function :

array (     [0] => 1     [1] => rahul ) 

it giving me error ..

warning: pdostatement::execute(): sqlstate[hy093]: invalid parameter number: number of bound variables not match number of tokens in /var/www/ryapi/db.php on line 176  fatal error: uncaught exception 'pdoexception' message 'database error [hy093]: , driver error code ' in /var/www/ryapi/db.php:179 stack trace: #0 /var/www/ryapi/db.php(93): db::_query('select case whe...', array) #1 /var/www/ryapi/card.php(152): db::getresult('select case whe...', array) #2 /var/www/ryapi/index.php(103): card->getcardlist('1', '', 'rahul') #3 {main}   thrown in /var/www/ryapi/db.php on line 179 

why error coming please suggest.

concat_ws(' ',firstname,lastname)  end)  '%?%' 

here, '%?%' not pdo param. should make it:

concat_ws(' ',firstname,lastname)  end)  ? 

then bind:

array (     [0] => 1     [1] => '%rahul%' )