Cause of the problem: the computer may not shut down properly, resulting in phpstrom not close properly.
At first I thought it was a configuration where there is a problem, so directly put configuration deleted, and then generate a default configuration. I found still not solve the problem. Then one by one to configure access to the past. Because my ide in English, read not very smooth (from my limited English vocabulary). Then look for a similar test over and over by a still unresolved.
Finally, when I want to give up. I opened my project. Themselves. My project inside a hidden folder called .idea. This look will know the name, certainly has a relationship with phpstrom. Then decisively cut out. Then restart phpstrom, returned to normal software can automatically open the last file of history. Thus the problem solved.
After the idea was I cut out my new idea and analyzing files comparison. Finalize the issue generated file name: workspace.xml
By comparing the files found new idea is normal xml file. The idea is not normal in the display is garbled. I think it might be too late to be caused. So it just confirmed the cause of the problem.
Solution: Delete hidden files in the project folder .idea