Using the Show Usages function, you can bring up a list of the usages of a symbol across the whole project. So doing, the pop-up window with the list of usages of a symbol features a toolbar with the following buttons:
Merge usages of the symbol from the same line.
Show read access to the symbol.
Show write access to the symbol.
Show usages in the import statements.
If this button is pressed, the found usages show under the corresponding method nodes.
Show search results in the Find Usages tool window.
Open the Find Usages dialog box for the selected symbol where you can change the search options.
To view the usages of a symbol across the project
Place the caret at the desired symbol in the editor.
On the main menu, choose Edit | Find | Show Usages, or press Ctrl+Alt+F7. PhpStorm displays the Show Usages pop-up window which lists all occurrences of the symbol at caret.
Examine and analyze the detected occurrences of the symbol:
Use the toolbar buttons to present search results in the desired way.
To jump from search results to a line of source code, click the desired entry.
To close the list, press Escape.
If necessary, customize the search options in the search options dialog box. To invoke the dialog box, do one of the following: