mysql - Array in where clause inside a for loop php

For some reason this query doesn't work

 $query2 = $db->query("SELECT META FROM hh_dia WHERE ID_LINHA = $Hoje->LINHA[$i]");

If I do like this it works.

$t = $Hoje->LINHA[$i];

$query2 = $db->query("SELECT META FROM hh_dia WHERE ID_LINHA = $t");