(PHP 5 <= 5.3.0, PECL ming SVN)
SWFFont::getWidth — Returns the string's width
$string
)此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
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.