fetch.php

<?php
session_start();
if(!isset($_SESSION['user']) || !isset($_SESSION['room'])) exit;

$room = $_SESSION['room'];
$path = "rooms/$room.txt";
if(!file_exists($path)) file_put_contents($path,"[]");

$messages = json_decode(file_get_contents($path), true);

foreach($messages as $i=>$m){
    $clase = $m['clase'];
    echo "<div class='$clase' data-index='$i'>";
    echo "<b>".htmlspecialchars($m['user']).":</b> ";

    if($m['msg']!=='') echo htmlspecialchars($m['msg']);

    if($m['file']){
        $fileUrl = $m['file']['ruta'];
        if($m['file']['tipo']=='img'){
            echo "<br><img src='$fileUrl'>";
        } else {
            echo "<br><audio controls src='$fileUrl'></audio>";
        }
    }

    echo " <span class='msg-meta'>[{$m['hora']}]</span>";
    echo "</div>";
}
?>