Switch boot JDK
PhpStorm includes JetBrains Runtime (based on OpenJDK 11), which is used by default. It is recommended to run PhpStorm using JetBrains Runtime, which fixes various known OpenJDK and Oracle JDK bugs, and provides better performance and stability. But in some cases you may be required to use another Java runtime or a specific version of JetBrains Runtime.
Switch the Java runtime used to run PhpStorm
On the Help menu, click Find Action, or press Ctrl+Shift+A.
Find and select the Switch Boot JDK action.
Select the desired JDK and click OK.
By default, the list includes runtimes that PhpStorm is able to detect. If you want to use a runtime that was not detected, click and specify the location of the desired Java home directory.
The path to the selected runtime is stored in the phpstorm.jdk file in the PhpStorm configuration directory. To revert to the default JetBrains Runtime, you can delete this file, or modify the path to point to another Java runtime.
You can also override the runtime used for PhpStorm by adding the
PHPSTORM_JDK environment variable with the path to the desired JDK home directory.