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Guides
Outline tree

Navigate PDF outline tree in PHP

To navigate an outline tree and print its result.

function PrintIndent ($item) {
	$ident = $item->GetIndent() - 1;
	for ($i=0; $i<$ident; ++$i) {
		echo "     ";
	}
}
function PrintOutlineTree($item) {
	for (; $item->IsValid(); $item=$item->GetNext()) {
		PrintIndent($item);
		echo ($item->IsOpen() ? "- " : "+ ").$item->GetTitle()." ACTION -> ";
		if ($item->HasChildren()) {
			PrintOutlineTree($item->GetFirstChild());
		}
	}
}
$doc = new PDFDoc($filename);
$root = $doc->GetFirstBookmark();
PrintOutlineTree($root);

Read, add, edit PDF outlines and bookmarks
Full code sample which illustrates how to read and edit existing outline items and create new bookmarks using the high-level API.

About outline tree

A PDF document may display a document outline on the screen, allowing the user to navigate interactively from one part of the document to another. The outline consists of a tree-structured hierarchy of Bookmarks (sometimes called outline items), which serve as a "visual table of contents" to display the document's structure to the user.

Each Bookmark has a title that appears on screen, and an Action that specifies what happens when a user clicks on the Bookmark. The typical Action for a user-created Bookmark is to move to another location in the current document — although any Action can be specified.

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