In the CLI version, you can do:

     'php -l {filename}'

and find out whether the file you specified is syntactically correct.

This would be a powerful feature to be able to call from userland when deciding whether or not to include files based on whether or not they are valid PHP files.

I know this is in the Zend area of things, but it would be a very cool addition.

In /sapi/cli/php_cli.c, it seems like a trivial function. Before creating a function to submit, or someone beating me to it, is there a good reason NOT to do this?