Untitled

--- index.php ---
<?php

session_start();

include 'functions.php';

if (!isset($_SESSION['is_logged'])) {

	if (!isset($_REQUEST['log_in'])) {

		echo '<html>
		      <link rel="stylesheet" type="text/css" href="style.css">
		      <body>
		      <div>
		      <form action="'.$_SERVER['SCRIPT_NAME'].'" method="POST">
			    <input type="text" name="nick" value=""><br>
			    <input type="submit" name="log_in" value="Войти">
		      </form>
		      </div>
		      </body>
		      </html>';

	} else {

		$_SESSION['is_logged'] = 1;
		exit("<meta http-equiv='refresh' content='0; url= $_SERVER[PHP_SELF]'>");

	}

} else {

	db_connect();

	$post_count = db_get_post_count();

	echo '<html>
	      <link rel="stylesheet" type="text/css" href="style.css">
	      <body>
	      <div>
	      <form action="'.$_SERVER['SCRIPT_NAME'].'" method="POST">
		    <textarea class="chat_field" readonly>';


	while($post_text = db_read_message()) {
		echo $post_text['time'];

	}

	echo '	    </textarea>
	   	    <textarea class="users_field" readonly></textarea><br>
		    <input class="message_field" type="text" name="message_field" value="">
		    <input type="submit" name="post_message" value="ОК">
		    <input type="submit" name="log_out" value="Выйти">
	      </form>
	      </div>
	      </body>
	      </html>';

	if (isset($_REQUEST['log_out'])) {

		session_destroy();
		exit("<meta http-equiv='refresh' content='0; url= $_SERVER[PHP_SELF]'>");

	}

}

?>

--- functions.php ---
<?php

function db_connect() {
include 'config.php';
	mysql_connect($host, $user, $password);
	mysql_select_db($database);
}

function db_post_message($nick, $message) {
	$time = date("H:i:s");
	$query = mysql_query("INSERT INTO chat (id, time, nick, message) VALUES ('', '$time', '$nick', '$message')");
}

function db_read_message() {
	$query = "SELECT * FROM chat ORDER BY `id`";
	$result = mysql_fetch_array(mysql_query($query));
	return $result;

}

function db_get_post_count() {
	$query = "SELECT COUNT(1) FROM chat";
	$result = mysql_fetch_array(mysql_query($query));
	return $result[0];
}

?>

--- config.php ---
<?php

$host = 'localhost';	// Имя хоста
$database = 'chat';	// Имя базы данных
$user = 'root';		// Имя пользователя
$password = '';		// Пароль

?>

--- style.css ---
textarea.chat_field {
	resize: none;
	height: 97%;
	width: 89%;
}

textarea.users_field {
	resize: none;
	height: 97%;
	width: 10%;
}

input.message_field {
	width: 89%;
}