Sajax 응용 : 채팅

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<?php
    //
    // The world's least efficient wall implementation
    //
    require("../sajax-0.12/Sajax.php");
    function colorify_ip($ip)
    {
        $parts = explode(".", $ip);
        $color = sprintf("%02s", dechex($parts[1])) .
                 sprintf("%02s", dechex($parts[2])) .
                 sprintf("%02s", dechex($parts[3]));
        return $color;
    }
    function add_line($msg) {
        $f = fopen("./tmp/wall.html", "a");
        $dt = date("Y-m-d h:i:s");
        $msg = rawurldecode($msg);
        $msg = strip_tags(stripslashes($msg));
        $remote = $_SERVER["REMOTE_ADDR"];
        // generate unique-ish color for IP
        $color = colorify_ip($remote);
        fwrite($f, "<span style=\"color:#$color\">$dt</span> $msg<br>\n");
        fclose($f);
    }
    function refresh() {
        $lines = file("./tmp/wall.html");
        // return the last 25 lines
        return join("\n", array_slice($lines, -25));
 
 
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