chatbox.php - Shared Memory

File:

chatbox.php

Role:

Example script

Content type:

text/plain

Description:

Usage example

Class:

Shared Memory
Store and retrieve information in shared memory

Contents

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<?
    include_once "sharedmemory.class.php";

    $s = new SharedMemory(54645645);                    //create instance of shared memory object
    $history = $s->Get();                        //read contents
    
    $username = isset($_POST["username"])?$_POST["username"]:"Anonymous";
    
    //add user message to history and write result back to shared memory
    if (isset($_POST["chat"]) && $_POST["chat"] != "") {
        $history .= sprintf("%s says: %s", $username, $_POST["chat"].chr(13));
        //strip oldest message if history exceeds 200 lines
        if (substr_count($history, chr(13)) > 200) {
            $history = substr($history, 1+strpos($history, chr(13)));
        }
        $s->Set($history);
    }
    
    //render history to textarea
    echo "<textarea rows=30 cols=80>$history</textarea>";
    
    //render user input controls
    echo "<form method='POST'>";
    echo "  <input type='text' size=20 name='username' value='$username'>";
    echo "  <input type='text' size=40 name='chat'>";
    echo "  <input type='submit' value='Send/Refresh'>";
    echo "</form>";
?>

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File: chatbox.php

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