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I have PHP added as an env variable - set to C:\Program Files\PHP\v7.3, but when I run php from CMD the window locks up and it just hangs indefinitely. When run "C:\Program Files\PHP\v7.3\php.exe" directly then the interactive shell starts normally.

No errors in the event log. Microsoft Visual C++ 2019 redistributable is installed. No other versions of PHP present (though there was an old version installed historically).

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    I have PHP added as an env variable Please show us how you did this Commented Aug 31, 2021 at 13:07
  • System Properties>Environment Variables>append file path; C:\Program Files\PHP\v7.3 Commented Aug 31, 2021 at 13:28

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To run PHP in an interactive mode you need to pass the -a flag

example :

php -a or C:\Program Files\PHP\v7.3\php.exe -a

Running both php or C:\Program Files\PHP\v7.3\php.exe will cause the terminal to hang and a CLI php process to start

You can quit the process by pressing Ctrl + C

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OK, this does explain the problem and is me misunderstanding how IIS invokes PHP when needed by a site. Sorry, I am fairly new. I was hoping this would be the crux of the problem but it seems PHP is installed and working correctly. Now I need to figure out why my Cisco phone directory site is unable to use this version of PHP. Yay! Thank you, lotfio.
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Running only the php command will cause this problem. php -r command can be used to run PHP code on CLI. Example: php -r 'echo "Hello world!";'

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