If width = 0, the annotation borders will be invisible.
pdf_set_border_style
(PHP 3 >= 3.0.12, PHP 4, PECL)
pdf_set_border_style -- Sets style of border around links and annotationsDescription
bool pdf_set_border_style ( resource pdfdoc, string style, float width )Sets the border style for all kinds of annotations. style is solid or dashed. 如果成功则返回 TRUE，失败则返回 FALSE。
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