(PHP 5 < 5.3.0, PECL ming SVN)
SWFFont::getWidth — Returns the string's width
$string) : float
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.
swffont::getwidth() returns the string
string's width, using font's default scaling.
You'll probably want to use the swftext() version of this method which
uses the text object's scale.