(PECL imagick 2, PECL imagick 3)
Imagick::setImageExtent — Sets the image size
public Imagick::setImageExtent ( int $columns , int $rows ) : bool
Sets the image size (i.e. columns & rows).
columns
rows
 Returns true on success. 
Throws ImagickException on error.
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    https://www.php.net/manual/en/imagick.setimageextent.php