The search command
(Ctrl+Shift+F7Ctrl+Shift+F7Ctrl+Shift+7Ctrl+Shift+F7Ctrl+Shift+F7Ctrl+Shift+F7Ctrl+Shift+F7Alt+Shift+O or Ctrl+Shift+F7Meta Shift F7Meta Shift F7Meta Shift F7)
makes it possible to visualize usages of a symbol in the current file.
All found usages of a symbol in the current file
are highlighted and color-coded, as defined in the Colors and Fonts dialog box,
to represent read or write access to the symbol. In addition to the highlights of
occurrences in text, the stripes of the same colors appear in the marker bar, accompanied with tooltips.

The behavior of usage highlighting is configurable: you can make PhpStorm show usages of a symbol
at caret automatically, or invoke it with a command.
This section describes how to: