This just isn't my day as far as configuring PhpStorm. In settings, under Languages & Frameworks > PHP > CLI Interpreter, when I enter the path to my PHP executable it says "PHP version: Not installed". (The path is C:\Users\[MYUSERNAME]\PHP\current\php.exe.) When I click the refresh icon next to the path I get the message "Failed to parse validation script output". There's nothing wrong with the executable. In cmd.exe I enter "php --version" and get this output:
PHP 7.4.3 (cli) (built: Feb 18 2020 17:29:57) ( NTS Visual C++ 2017 x64 )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
Restarting PhpStorm didn't help.