Find All References
The Find All References window lists all the occurrences of a symbol. In case the reference is not sure, e.g. it is a part of a dynamic call or it is a part of a callback specified as a string, the occurrence is grayed.
The feature also looks into string values to match for function names or string parameters of
constant() to match for global constant names. Types and parameters within PHPDoc comments are also matched.
Note: To improve finding class member references, use type hints or PHPDoc type hints. This helps the editor to resolve types more precisely.
Using 'Find All References'
Navigate the keyboard cursor at a symbol like function name, variable, class name etc., and either press Shift+F12 or right click the symbol and choose Find All References. If references can be resolved, a window with the resulting list is displayed, together with each occurrence location and text of the containing line.