Php array error with sendgrid -


this script sending newsletter users. code below has limit 5 testing. i'm having error:

catchable fatal error: argument 1 passed sendgrid\email::settos() must of type array, string given, called in /var/www/web/web/sengrid.php on line 44 , defined in /var/www/web/web/sendgrid-php/lib/sendgrid/email.php on line 90**

<?php ini_set("display_errors", "1"); error_reporting(e_all); require_once ('inc/db.php'); require("sendgrid-php/sendgrid-php.php");  $sendgrid = new sendgrid('myapikey');  $email    = new sendgrid\email();   $resultado = mysqli_query($dbc,"select email, hash newsletter enviado = '0' , newsletter = '1' limit 5");  $totalrows = mysqli_num_rows($resultado); if ($totalrows == 0){    echo "<p>no results</p>"; }  $rss = "";  if(!$xml = simplexml_load_file('http://www.test.com.ar/rss.php') ) {      echo 'unable load xml file'; } else {      foreach( $xml->channel->aviso $aviso ) {           $rss .= "<div class='box-blanco'>";         $rss .= "<a href='$aviso->link' class='link'><p class='titulo'>$aviso->title</p></a>";         $rss .= "<p class='text-muted-2'>$aviso->provincia $aviso->remuneracion</p>";         $rss .= "</div><div class='col-separador-h'></div>";      }          }

here loop sending email using settos. 

while ($usuario = mysqli_fetch_array($resultado, mysqli_assoc)) {    $usermail = $usuario['email'];   $hash = $usuario['hash'];  $email-> settos($usermail)   ->setfrom("no_responder@test.com.ar")   ->setfromname("test")   ->setreplyto("no_responder@test.com.ar")   ->setsubject("convocatorias semanales")   ->sethtml('<html><body>test</body></html>');        try {      $result = $sendgrid->send($email);             mysqli_query($dbc, "update newsletter set enviado = '1' email='$usermail' ");              echo "enviado";      } catch(\sendgrid\exception $e) {         echo $e->getcode() . "\n";         foreach($e->geterrors() $er) {             echo $er;         }     }  }   ?>

how can solve this? can't figure out. https://github.com/sendgrid/sendgrid-php/tree/master/lib/helpers/mail

it says expecting array, feed it:

$email-> settos(array($usermail));

this band aid fix though, might want emails first inside container, send it:

$all_users = array(); // intialzie array  while ($usuario = mysqli_fetch_array($resultado, mysqli_assoc)) {      $usermail = $usuario['email'];      $hash = $usuario['hash'];     mysqli_query($dbc, "update newsletter set enviado = '1' email='$usermail' ");       $all_users[] = $usermail; // push emails first }  // send   try {     $email->settos($all_users)     ->setfrom("no_responder@test.com.ar")     ->setfromname("test")     ->setreplyto("no_responder@test.com.ar")     ->setsubject("convocatorias semanales")     ->sethtml('<html><body>test</body></html>');      $result = $sendgrid->send($email);     echo "enviado";  } catch(\sendgrid\exception $e) {     echo $e->getcode() . "\n";     foreach($e->geterrors() $er) {         echo $er;     } }

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