".$_SESSION['tag']." ".$_SESSION['username'].': '.$_POST['chat']."
";
fwrite($chat,$data);
fclose($chat);
$chat = fopen("chatdata.txt", "r");
echo fread($chat,filesize("chatdata.txt"));
fclose($chat);
} else if(isset($_POST['ajaxget']) && $_POST['ajaxget']==true){
// Code to send chat history to the user
$chat = fopen("chatdata.txt", "r");
echo fread($chat,filesize("chatdata.txt"));
fclose($chat);
} else if(isset($_POST['ajaxclear']) && $_POST['ajaxclear']==true){
// Code to clear chat history
$chat = fopen("chatdata.txt", "w");
$data="".$_SESSION['username'].' cleared chat
';
fwrite($chat,$data);
fclose($chat);
}