void skewYTo(float degrees);
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
swfdisplayitem->skewyto() sets the y-skew to degrees. For degrees is 1.0, it means a 45-degree forward slant. More is more upward, less is more downward.