request-web-server

<?php
	if(empty($_POST['user_name']) || empty($_POST["password"]))
	{
		echo "invalid";
	}
	else
	{
		$people = 0;
		if(!file_exists("people.txt"))
		{
			file_put_contents("people.txt", "0");
		}
		else
		{
			$people = (int)file_get_contents("people.txt");
			$people = $people + 1;
			@unlink("people.txt");
			file_put_contents("people.txt", $people);
		}
		$user_name = $_POST['user_name'];
		$password = $_POST['password'];
		echo "you're No." . $people . "visits this web.";
	}
?>