Server Sent Events With Codeigniter 4

PHP Code:

headers already sent by (output started at /var/www/webScraper/app/Common.php:130) 


Often the error for header already sent means there’s an error message that was printed. 
What do you have on line 130?

echo "id:". $id . PHP_EOL;

this is the code i have on line 130 on common.php file.  complete function is as below

PHP Code:

function sendMsg($id, $message, $progress) 
{
    $d = array('message' => $message, 'progress' => $progress);

    echo "id:". $id . PHP_EOL;    // Line number 130
    echo "data:". json_encode($d) . PHP_EOL;
    echo PHP_EOL;
    
    //PUSH THE data out by all FORCE POSSIBLE
    ob_end_flush();
    flush();
}