makeImage with PHP function

function.textoimage.php

<?php
function makeImage( $msg, $msg2, $font='./arial.ttf', $fontsize=40, $output='pic1.png')
{

$fontcolor = imagecolorallocate($im, 128, 128, 128);
  
  echo $msg;
  echo "<br/>".$msg2;

  $backgroundImg = imagecreatefromjpeg("logo-usarmy-with-texture-640x360.jpg");
  $cor = imagecolorallocate($backgroundImg, 0,0,0);
  // imagestring($backgroundImg,5,126,22,"Dear Roy Nelsen", $cor);

  // position msg
  $tb = imagettfbbox($fontsize, 0, $font, $msg);
  $x = ceil((640 - $tb[2]) / 2);
  $y = ceil((360 - $tb[3]) / 2);

  // POSITION msg2
  $tb2 = imagettfbbox($fontsize, 0, $font, $msg2);
  $x2 = ceil((640 - $tb2[2]) / 2);
  $y2 = ceil((360 - $tb2[3]) / 2 + 60);

  imagettftext($backgroundImg, $fontsize, 0, $x, $y, $fontcolor, $font, $msg);
  imagettftext($backgroundImg, $fontsize, 0, $x2, $y2, $fontcolor, $font, $msg2);

  header('Content-type: image/png');
  imagepng($backgroundImg, "message1.png");
  imagedestroy($backgroundImg);
  
}
?>