phpstorm replace array() notation to [ ] short syntax

Open File->Settings... Click Editor->Code Style->PHP->Code Conversion

Now you can find block "Array declaration style" at the bottom.

If you check checkbox "Force short declaration style" your "array(...)" became "[...]" when you run Reformat code (Ctrl+Shift+L).

1. Code | Inspect Code... --- run it on your files. One of the inspections called "Traditional syntax array literal detected".

   Alternatively just run that specific inspection only via Code | Run Inspection by Name...

2. Once done, you will see a list with results. Find that particular inspection in results (in case if 1st option was used (all inspections)).

3. From there you can apply "Fix it" action on all (or individual) results of that inspection.

P.S. This inspection/fix available since PhpStorm v7.1.