<?php include("query.php"); ?>


<select name="rua">
    <?php echo queryFunction("name"); ?>
</select>

+++++++
query.php:

<?php
function queryFunction($table) {
    $connection = pg_connect(...);
    $query = "SELECT name FROM $table ORDER BY name ASC;";
    $results = pg_query($connection, $query);
    $rows = pg_num_rows($results);
    $string = "name";

    for ($i=0; $i < $rows; $i++) {
        $string = $string . "<option>" . pg_fetch_result($results, $i, 0) . "</option>";
    }

    return $string;
}
?>