(PECL imagick 2, PECL imagick 3)
Imagick::setImageVirtualPixelMethod — Sets the image virtual pixel method
public Imagick::setImageVirtualPixelMethod ( int $method ) : bool
Sets the image virtual pixel method.
method
 Returns true on success. 
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    https://www.php.net/manual/en/imagick.setimagevirtualpixelmethod.php