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That parameter is mostly useless in practise, and likely has been directly ported from the underlying `gdImagePolygon()` and friends, which require that parameter since the number of elements of the point array would otherwise be unknown. Typical usages of `imagepolygon()`, `imageopenpolygon()` and `imagefilledpolygon()` pass `count($points)/2` or hard-code this value as literal. Since explicitly specifying this parameter is annoying and error-prone, we offer the possibility to omit it, in which case the `$points` array must have an even number of elements, and the number of points is calculated as `count($points)/2`.