‘php.exe’ is not recognized as an internal or external command, operable program or batch file

Question

‘php.exe’ is not recognized as an internal or external command, operable program or batch file.

Why does that error occur even though

Answer 1

it is very easy to do
You need to also add php.exe
Adding this path:
windows key + pause
click on Advance system settings
click Environment Variable
System variables part -> Path -> Edit and the add
C:\wamp\bin\php\php5.3.8;
close you cmd prompt if its open
It's Done!