ps_string_geometry
说明
array ps_string_geometry ( resource psdoc, string text [, int fontid [, float size]] )This function is similar to ps_stringwidth() but returns an array of dimensions.
返回值
An array of the dimensions of a string. The element 'width' contains the width of the string as returned by ps_stringwidth(). The element 'descender' contains the maximum descender and 'ascender' the maximum ascender of the string.