(PECL imagick 2.0.0)
ImagickDraw::setFontWeight — Sets the font weight
$font_weight
   )This function is currently not documented; only its argument list is available.
Sets the font weight to use when annotating with text.
font_weight
Example #1 ImagickDraw::setFontWeight()
<?php
function setFontWeight($fillColor, $strokeColor, $backgroundColor) {
    $draw = new \ImagickDraw();
    $draw->setStrokeColor($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();
}
?>