$im = ImageCreate(320,240);

$gray = ImageColorAllocate($im, 153, 153, 153);
$black = ImageColorAllocate($im, 0,0,0);

$size = 48;
$angle = 0;
$x = 90;
$y=135;
$fontfile = 'arial.ttf';
$text = 'Foo.';

ImageTTFText($im, $size, $angle, $x, $y, $black, $fontfile, $text);

header('Content-type: image/png');
ImagePng($im);
ImageDestroy($im);