Answers for "how to execute a php script from the command line?"

php run command line

shell_exec('ls');
// or
exec('ls');

execute php file from command line

php -f /path/to/your/file.php

how to execute a php script from the command line?

To execute a php script, use the PHP Command Line interface(CLI) and specify the file name of the script in the following way:
php script.php