Class help

[darkfreaks]

is there a way to make sure in the following function that if emptyto stop it from inserting? it only checks for if isset.

 

<?php
///------> the following lines are the code i think it is
/**
 * These next lines will retrieve the necessary fields. These include username,
 * password & confirmation, email & confirmation and possibly the security image.
 */
$username = (isset($_POST['username']) 
&& $this->validate_username($_POST['username'])) ? 
$this->qls->Security->make_safe($_POST['username']) : false;
$password = (isset($_POST['password']) && $this->validate_password
($_POST['password'])) ? $this->qls->Security->make_safe($_POST['password']) : false;
$confirm_password = (isset($_POST['password_c']) 
&& $_POST['password_c'] == $password) ? true : false;
$email = (isset($_POST['email']) && strlen($_POST['email']) >
6 && strlen($_POST['email']) < 256 && eregi
('^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)
*(\.[a-z]{2,3})$', $_POST['email'])) ? $this->qls->Security->make_safe($_POST['email']) : false;
$confirm_email = (isset($_POST['email_c']) && $_POST['email_c'] == $email) ? true : false;
	if ($this->qls->config['security_image'] == 'yes') {
	// The random id of the image
	$random_id = (isset($_POST['random_id']) && 
preg_match
('/^[a-fA-F0-9]{40}$/', $_POST['random_id'])) ? $this->qls->
Security->make_safe($_POST['random_id']) : false;

	// The security code entered by the user
	$security_code = (isset($_POST['security_code']) && preg_match('/[a-zA-Z1-9]{5,8}/', $_POST['security_code'])) ? $_POST['security_code'] : false;
		if ($this->qls->Security->check_security_image($random_id, $security_code)) {
		$security_check = true;
		}
	}
	else {
	$security_check = true;
	}

	if ($username === false) {
	$this->register_error = REGISTER_USERNAME_ERROR;
	return false;
	}

	if ($this->check_username_existance($username)) {
	$this->register_error = REGISTER_USERNAME_EXISTS;
	return false;
	}

	if ($password === false || $confirm_password === false) {
	$this->register_error = REGISTER_PASSWORD_ERROR;
	return false;
	}

	if ($email === false || $confirm_email === false) {
	$this->register_error = REGISTER_EMAIL_ERROR;
	return false;
	}

	if ($security_check === false) {
	$this->register_error = REGISTER_SECURITY_ERROR;
	return false;
	}

$this->insert_registration_data($username, $password, $email, $save);
return true;
}
///<--------------------end

?>