(PECL imagick 2 >= 2.3.0, PECL imagick 3)
ImagickDraw::setTextInterwordSpacing — Description
public ImagickDraw::setTextInterwordSpacing ( float $spacing ) : bool
Sets the text interword spacing.
spacing
 Returns true on success. 
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    https://www.php.net/manual/en/imagickdraw.settextinterwordspacing.php