how to search array words with Doctrine DQL using bucle - symfony

Question

i'm trying to search words stored in array in this way:
$dql_cat =' SELECT c
FROM FrontendBundle:Categoria c
WHERE';
foreach ($palabras as $palabra){
if ($palabra === reset($palabras)){
$dql_cat .= ' c.nombre LIKE %'.$palabra.'%';
}
else{
$dql_cat .= ' OR c.nombre LIKE %'.$palabra.'%';
}
}
$dql_cat .= ' ORDER BY c.nombre';
$query = $em->createQuery($dql_cat);
$resultados['categorias'] = $query->getResult();
But i get an exception with the query.
Query result:
SELECT c
FROM FrontendBundle:Categoria c
WHERE c.nombre LIKE %carpinteria% OR c.nombre LIKE %aluminio% ORDER BY c.nombre
Query exception:
QueryException: [Syntax Error] line 0, col 98: Error: Expected StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings | AggregateExpression, got '%'
I think that is more proper to use queryBuilder to avoid mistakes but i don't know how to use it with a parameters array.
I need a solution with or without queryBuilder.
Thanks.

Answer 1

queryBuilder would be as follows:
$qb = $em->createQueryBuilder();
$qb->select('c')
->from('FrontendBundle:Categoria', 'c');
foreach ($palabras as $palabra){
if ($palabra === reset($palabras)){
$qb->where($qb->expr()->like('c.nombre', $qb->expr()->literal('%' . $palabra . '%')));
}
$qb->orWhere($qb->expr()->like('c.nombre', $qb->expr()->literal('%' . $palabra . '%')));
}
$query = $qb->orderBy('c.nombre', 'ASC')
->getQuery();
$resultados['categorias'] = $query->getResult();

Answer 2

To begin with %$palabra% should be quoted, right?:
foreach ($palabras as $palabra){
if ($palabra === reset($palabras)){
$dql_cat .= " c.nombre LIKE '%".$palabra."%'";
}
else{
$dql_cat .= " OR c.nombre LIKE '%".$palabra."%'";
}
}