(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::resetImagePage — Reset image page
public Imagick::resetImagePage ( string $page ) : bool
The page definition as a string. The string is in format WxH+x+y. This method is available if Imagick has been compiled against ImageMagick version 6.3.6 or newer.
page
 The page definition. For example 7168x5147+0+0 
 Returns true on success. 
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    https://www.php.net/manual/en/imagick.resetimagepage.php