PHP - Returning Values From A Function By Reference

SELECT u.firstname AS 'Name' , u.lastname AS 'Surname', c.shortname AS 'Course', (
            CASE
            WHEN gi.itemname LIKE '%summative%' THEN 'SUMMATIVE'
            WHEN gi.itemname LIKE '%formative 2%' THEN 'FORMATIVE 2'
            ELSE 'MC'
            END) AS 'Assessment', from_unixtime(gi.timemodified, '%d/%m/%y') AS 'Date',
            IF (ROUND(gg.finalgrade / gg.rawgrademax * 100 ,2) > 70,'Yes' , 'No') AS Pass, ROUND(gg.finalgrade / gg.rawgrademax * 100 ,2) AS 'Mark', ROUND(gg.finalgrade / gg.rawgrademax * 100 ,2) AS 'Mark'
            FROM mdl_course AS c
            JOIN mdl_context AS ctx ON c.id = ctx.instanceid
            JOIN mdl_role_assignments AS ra ON ra.contextid = ctx.id
            JOIN mdl_user AS u ON u.id = ra.userid
            JOIN mdl_grade_grades AS gg ON gg.userid = u.id
            JOIN mdl_grade_items AS gi ON gi.id = gg.itemid
            JOIN mdl_course_categories AS cc ON cc.id = c.category
            WHERE gi.courseid = c.id
            AND gi.itemname != 'Attendance'
            AND u.firstname LIKE '%03%'
            AND gi.itemname LIKE '%mative%'
            ORDER BY  `Name` , `Surname` , `Course`, `Assessment` ASC

Name 		Surname		Category 	Module 		Course 		Assessment 	Date 		Competent 	Mark 	
G03 Itumeleng 	Velmah Mokwa 	Fundamentals 	Communications 	CO1 119472 	FORMATIVE 2 	07/04/14 	Yes 		100.00
G03 Itumeleng 	Velmah Mokwa 	Fundamentals 	Communications 	CO1 119472 	SUMMATIVE 	07/04/14 	Yes 		100.00
G03 Itumeleng 	Velmah Mokwa 	Fundamentals 	Communications 	CO2 119457 	FORMATIVE 2 	05/04/14 	Yes 		100.00
G03 Itumeleng 	Velmah Mokwa 	Fundamentals 	Communications 	CO2 119457 	SUMMATIVE 	05/04/14 	Yes 		88.00
G03 Lally 	Sheila Mokane 	Fundamentals 	Communications 	CO1 119472 	FORMATIVE 2 	07/04/14 	NYC 		59.00
G03 Lally 	Sheila Mokane 	Fundamentals 	Communications 	CO1 119472 	SUMMATIVE 	07/04/14 	Yes 		90.00
G03 Lally 	Sheila Mokane 	Fundamentals 	Communications 	CO2 119457 	FORMATIVE 2 	05/04/14 	Yes 		100.00
G03 Lally 	Sheila Mokane 	Fundamentals 	Communications 	CO2 119457 	SUMMATIVE 	05/04/14 	Yes 		98.00

function print_overview_table_groups($COURSE, $choosegroup, $fromdate, $todate, $numarray)
{
    global $DB;
    //check data
    if(!$choosegroup){
        die('No Records To Display.');
    }
   
    $thisgroup = $numarray[$choosegroup];
       
        $sql = "SELECT DISTINCT u.firstname AS 'Name' , u.lastname AS 'Surname', 
			(CASE
			WHEN cc.parent = '2' THEN 'Fundamentals'
			WHEN cc.parent = '3' THEN 'Core'
			WHEN cc.parent = '4' THEN 'Elective'			
			END) AS 'Category',
			cc.name AS 'Module', 
			c.shortname AS 'Course', 
			(CASE
			WHEN gi.itemname LIKE '%summative%' THEN 'SUMMATIVE'
			WHEN gi.itemname LIKE '%formative 2%' THEN 'FORMATIVE 2'
			ELSE 'MC'
			END) AS 'Assessment', from_unixtime(gi.timemodified, '%d/%m/%y') AS 'Date',
			IF (ROUND(gg.finalgrade / gg.rawgrademax * 100 ,2) > 70,'Yes' , 'NYC') AS Competent, ROUND(gg.finalgrade / gg.rawgrademax * 100 ,2) AS 'Mark'
			FROM mdl_course AS c
			JOIN mdl_context AS ctx ON c.id = ctx.instanceid
			JOIN mdl_role_assignments AS ra ON ra.contextid = ctx.id
			JOIN mdl_user AS u ON u.id = ra.userid
			JOIN mdl_grade_grades AS gg ON gg.userid = u.id
			JOIN mdl_grade_items AS gi ON gi.id = gg.itemid
			JOIN mdl_course_categories AS cc ON cc.id = c.category
			WHERE gi.courseid = c.id
			AND gi.itemname != 'Attendance'
			AND u.firstname LIKE '%03%'
			AND gi.itemname LIKE '%mative%'
			ORDER BY  `Name` , `Surname` , `Course`, `Assessment` ASC";

        return $DB->get_records_sql($sql);
   
}

$lists = print_overview_table_groups($COURSE, $choosegroup, $fromdate, $todate, $numarray);
   
	print "<pre>";
	print_r($lists);
	print "</pre>";

Array
(
    [G03 Itumeleng] => stdClass Object
        (
            [name] => G03 Itumeleng
            [surname] => Mokwa
            [category] => Fundamentals
            [module] => Communications
            [course] => CO2 119457
            [assessment] => SUMMATIVE
            [date] => 05/04/14
            [pass] => Yes
            [mark] => 88.00
        )

    [G03 Lally] => stdClass Object
        (
            [name] => G03 Lally
            [surname] => Mokane
            [category] => Fundamentals
            [module] => Communications
            [course] => CO2 119457
            [assessment] => SUMMATIVE
            [date] => 05/04/14
            [pass] => Yes
            [mark] => 98.00
        )

)

<?php
error_reporting(E_ALL);
ini_set("display_errors", 1);
require("../PHPMailer/class.phpmailer.php");
include 'includes.php';
        $mail = new PHPMailer;
        $subject = $_POST['subject'];
        $text = $_POST['newsletterBody'];
        $mail->IsSMTP();                                      // Set mailer to use SMTP
        $mail->Host = 'localhost';  // Specify main and backup server
        $mail->Port = '465';
        $mail->SMTPAuth = true;                               // Enable SMTP authentication
        $mail->Username = '**EMAIL_USERNAME**';                            // SMTP username
        $mail->Password = '**EMAIL_PASSWORD**';
        $mail->SMTPAuth = true;
        $mail->SMTPSecure = 'ssl';                            // Enable encryption, 'ssl' also accepted

        $mail->From = '**EMAIL_ADDRESS**';
        $mail->FromName = '**EMAIL_NAME';
        
    
        $email = getEmail("62", $DBH);
        
        
        foreach ($email as $newEmail)
                {
                    $addEmail = $newEmail->email;
                    $mail->AddAddress($addEmail);
                    $DBH = null;
                    $addEmail = "";
                }
        

        $mail->AddReplyTo('**EMAIL_REPLY_TO**', '**EMAIL_REPLY_TO_NAME**');
    
        $mail->WordWrap = 50;                                 // Set word wrap to 50 characters
        $mail->IsHTML(true);                                  // Set email format to HTML

        $mail->Subject = $subject;
        $mail->Body    = $text;
        $mail->AltBody = $text;

        if(!$mail->Send()) {
           echo 'Message could not be sent.';
           echo 'Mailer Error: ' . $mail->ErrorInfo;
           exit;
        }
        
            $insertSql = "INSERT INTO newsletter_log (date, title, body) VALUES (?,?,?)";
            $insertParams = array(time(), $subject, $text);
            $newsletterAdd = $DBH->prepare($insertSql);
            $newsletterAdd->execute($insertParams)
        
        echo 'Message has been sent <a href='newsletter.php'>Return back</a>";

?>

function getEmail($inId, $DBH)
    {
        if (!empty($inId))
        {
            $blogstmt = $DBH->prepare("SELECT email_addr FROM newsletter_emails WHERE id = :userId");
            $blogstmt->bindParam(":userId", $inId);
            $blogstmt->execute();
        }
        else
        {
            $blogstmt = $DBH->prepare("SELECT * FROM newsletter_emails");
            $blogstmt->execute();
        }
    
        $postArray = array();
        
        $results = $blogstmt->fetchAll(PDO::FETCH_ASSOC);
        foreach($results as $row){
            $myPost = new nlEmails($row["id"], $row['email'], $DBH);
            array_push($postArray, $myPost);
        }
        
        return $postArray;
        $DBH = null;
    }
 
class nlEmails {
    public $id;
    public $email;
    
    function __construct($inId=null, $inEmail=null, $DBH)
    {
        if(!empty($inId))
        {
            $this->id = $inId;
        }
        if(!empty($inEmail))
        {
        $this->email = $inEmail;
        }
    }
}