Function recaptcha_check_answer

Calls an HTTP POST function to verify if the user's guess was correct

Parameters summary
`string`	`$privkey`
`string`	`$remoteip`
`string`	`$challenge`
`string`	`$response`
`array`	`$extra_params = array()`	an array of extra variables to post to the server

Return value summary
`ReCaptchaResponse`	ReCaptchaResponse