Example

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

    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeWidth(4);

    $draw->setStrokeDashArray([10, 10]);
    $draw->rectangle(100, 50, 225, 175);

    $draw->setStrokeDashArray([20, 5, 20, 5, 5, 5,]);
    $draw->rectangle(275, 50, 400, 175);

    $draw->setStrokeDashArray([20, 5, 20, 5, 5]);
    $draw->rectangle(100, 200, 225, 350);

    $draw->setStrokeDashArray([1, 1, 1, 1, 2, 2, 3, 3, 5, 5, 8, 8, 13, 13, 21, 21, 34, 34, 55, 55, 89, 89, 144, 144, 233, 233, 377, 377, 610, 610, 987, 987, 1597, 1597, 2584, 2584, 4181, 4181,]);

    $draw->rectangle(275, 200, 400, 350);

    $image = new \Imagick();
    $image->newImage(500, 400, $backgroundColor);
    $image->setImageFormat("png");
    $image->drawImage($draw);

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