I want to run php from a command prompt in windows 10

First, check the location of the sample.php. Is it stored under C:\php-7.4.13\?
If you can see it from Apache, is it under C:\Apache24\htdocs\ for example?

Method 1

Once you have determined where to save it, open the command prompt and use the cd command to navigate to the appropriate folder.(Let's say C:\Apache24\htdocs)

 C:\>cdc:\Apache24\htdocs

Once you have moved the folder, check the dir command to see if the PHP file exists.

C:\Apache24\htdocs>dir

  ... A list of files that exist in the folder appears.

Once you have verified that you have a PHP file, try passing it to the arguments of the php command.

 C:\Apache24\htdocs>php sample.php

Method 2

You may want to know where to save the file and then specify the full path of the file as indicated in the comments.

C:\php-7.4.13>php C:\Apache24\htdocs\sample.php