Create WP User and send email notification

function wpcreateuser(){

		$loginName = rawurldecode($_REQUEST['login']);
		$firstName = rawurldecode($_REQUEST['firstname']);
		$lastName = rawurldecode($_REQUEST['lastname']);
		$email = rawurldecode($_REQUEST['email']);
		
		$user_data = array(
			'ID' => '',
			'user_pass' => wp_generate_password(),
			'user_login' => $loginName,
			'display_name' => $loginName,
			'first_name' => $firstName,
			'last_name' => $lastName,
			'user_email' => $email,
			'role' => get_option('default_role') // Use default role or another role, e.g. 'editor'
		);
		
		$tempPass = genTempPassword(8);
		$user_id = wp_insert_user( $user_data );
		wp_set_password($tempPass, $user_id);
		
		$headers = "From: Wordpress <".get_bloginfo('admin_email').">\r\n".'X-Mailer: PHP/' . phpversion();
		$subject = "[".get_bloginfo('name')."] Your username and password";
		$siteurl = get_bloginfo('siteurl')."/wp-login.php";
		$msg = wordwrap("Username: ".$loginName." \r\n "."Password: ".$tempPass." \r\n ".$siteurl);
		
		wp_mail($email, $subject, $msg, $headers);
		die();
	}
	
	function genTempPassword ($length = 8)
	{
		// given a string length, returns a random password of that length
		$password = "";
		// define possible characters
		$possible = "0123456789abcdfghjkmnpqrstvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
		$i = 0;
		// add random characters to $password until $length is reached
		while ($i < $length) {
			// pick a random character from the possible ones
			$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
			// we don't want this character if it's already in the password
			if (!strstr($password, $char)) {
				$password .= $char;
				$i++;
			}
		}
		return $password;
	}