PDF_set_layer_dependency
(PECL pdflib >= 2.0.0)
PDF_set_layer_dependency — Define relationships among layers
说明
PDF_set_layer_dependency
( resource
$pdfdoc
, string $type
, string $optlist
) : bool
Defines hierarchical and group relationships among layers. 成功时返回 TRUE， 或者在失败时返回 FALSE。
This function requires PDF 1.5.