How to execute PHP code from the command line?

Question

I would like to execute a single php statement like if(function_exists(\"my_func\")) echo \'function exists\'; directly with the command line without having to

Answer 1

Using PHP from the command line

use " instead of ' on windows when using the cli version with -r

php -r "echo 1"

-- correct

php -r 'echo 1'

-- incorrect

  PHP Parse error:  syntax error, unexpected ''echo' (T_ENCAPSED_AND_WHITESPACE), expecting end of file in Command line code on line 1