(PECL imagick 2, PECL imagick 3)
Imagick::displayImage — Displays an image
public Imagick::displayImage ( string $servername ) : bool
This method displays an image on a X server.
servername
The X server name
 Returns true on success. 
Throws ImagickException on error.
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    https://www.php.net/manual/en/imagick.displayimage.php