(PECL imagick 2.0.0)
ImagickDraw::setClipPath — Associates a named clipping path with the image
$clip_mask
   )This function is currently not documented; only its argument list is available.
Associates a named clipping path with the image. Only the areas drawn on by the clipping path will be modified as long as it remains in effect.
clip_maskthe clipping path name
No value is returned.
Example #1 ImagickDraw::setClipPath()
<?php
function setClipPath($strokeColor, $fillColor, $backgroundColor) {
    $draw = new \ImagickDraw();
    $draw->setStrokeColor($strokeColor);
    $draw->setFillColor($fillColor);
    $draw->setStrokeOpacity(1);
    $draw->setStrokeWidth(2);
    $clipPathName = 'testClipPath';
    $draw->pushClipPath($clipPathName);
    $draw->rectangle(0, 0, 250, 250);
    $draw->popClipPath();
    $draw->setClipPath($clipPathName);
    $draw->rectangle(100, 100, 400, 400);
    $imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}
?>