I'm a python developer, I've written this (similar to mc_project_get_issue_headers), but I'm not sure if it's a good way to do that.

function mc_project_get_issue_headers_for_version( $p_username, $p_password, $p_project_id, $p_version,$p_page_number, $p_per_page ) {
global $g_project_override;

$t_user_id = mci_check_login( $p_username, $p_password );
if( $t_user_id === false ) {
    return mci_soap_fault_login_failed();
}
if( $p_project_id != ALL_PROJECTS && !project_exists( $p_project_id ) ) {
    return SoapObjectsFactory::newSoapFault( 'Client', "Project '$p_project_id' does not exist." );
}

$g_project_override = $p_project_id;;

if( !mci_has_readonly_access( $t_user_id, $p_project_id ) ) {
    return mci_soap_fault_access_denied( $t_user_id );
}

$t_filter = array(
    'show_version' => Array(
        '0' => $p_version,
    ),
    'dir' => 'DESC',
    'sort' => 'id',
);

$t_orig_page_number = $p_page_number < 1 ? 1 : $p_page_number;
$t_page_count = 0;
$t_bug_count = 0;

$t_rows = filter_get_bug_rows( $p_page_number, $p_per_page, $t_page_count, $t_bug_count, $t_filter, $p_project_id );
$t_result = array();

// the page number was moved back, so we have exceeded the actual page number, see bug #12991
if ( $t_orig_page_number > $p_page_number )
    return $t_result;

foreach( $t_rows as $t_issue_data ) {
    $t_result[] = mci_issue_data_as_header_array( $t_issue_data);
}

return $t_result;

}