(PHP 5 <= 5.3.0, PECL ming SVN)
SWFFill::skewXTo — Sets fill x-skew
$x
   )This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
   Sets the fill x-skew to x.
  
x
       When x is 1.0, it is a 45-degree forward slant.
       More is more forward, less is more backward. 
      
No value is returned.