I recently faced this issue on macOS Ventura and now facing it on macOS Sonoma (Beta) as well. phpStorm fails to load and get stuck at the splash screen. This happens 3/5 times. Here's what I've done to fix the issue; which doesn't seem to solve the issue.
1. Totally removed phpStorm from macOS (cleaned up the folders as mentioned in the official uninstall guide)
2. Installed the fresh version from phpStorm website (2023.2)
3. phpStorm starts and then hangs on the splash screen. If I close it and start again, it sometimes works okay. But it's totally unreliable.
Let me know how to fix this issue.