can we call a php function into coldfusion coding?????????

Depends on what one needs to do.

Have a read of this:

http://corfield.org/entry/ColdFusion_8_running_PHP

--
Adam

Nope, as IIS can only pass one page to one handler, so it gets passed to ColdFusion *or* PHP. The only way it would work is to have a page with an iFrame containing a PHP page, but that's not calling a PHP function from ColdFusion.

Dare I ask what it is you're trying to achieve exactly? If it's an extremely complicated function that can't possibly be rewritten, you'd probably want to wrap it up in a webservice and call it from CF.