Structure window

Use the Structure window to view the general code structure of all PHP, HTML, JavaScript, and CSS source files open in the Editor Pane. For each source file, the Structure window displays a tree of symbol nodes, including modules, classes, functions, interfaces, namespaces, imports, and variables. Each node in the tree hierarchy can be expanded to display further detail, acting as an index to your source code.

To show Structure window:

The Structure window is synchronized with the editor: as you switch to another editor tab, the window displays the structure of the corresponding file. Contents of the current document appear in a tree structure that you can explore and navigate through the document.