Quickly Re-Open Recently Used Files
This tip applies to PHPStorm, WebStorm, and likely any other of the Jetbrain's IDEs.
Much like you can press ctrl / cmd + shift + t to re-open a previously closed tab in your browser, you can do something similar in PHPStorm.
In PHPStorm / WebStorm, the command is :
ctrl / cmd + e
I'm really not sure why they went with the e key, but I like to think of it as 'recently', putting the emphasis on the 'lee' sound. Terrible, I know, but it helps me remember the command.