Example

function setFontWeight($fillColor, $strokeColor, $backgroundColor)
{
    $draw = new \ImagickDraw();

    $draw->setFont(__DIR__ . "/../../../fonts/Arial.ttf");
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);

    $draw->setStrokeWidth(1);

    $draw->setFontSize(36);

    $draw->setFontWeight(100);
    $draw->annotation(50, 50, "Lorem Ipsum!");

    $draw->setFontWeight(200);
    $draw->annotation(50, 100, "Lorem Ipsum!");

    $draw->setFontWeight(400);
    $draw->annotation(50, 150, "Lorem Ipsum!");

    $draw->setFontWeight(800);
    $draw->annotation(50, 200, "Lorem Ipsum!");

    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);

    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}