12c06-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 63 行

<?php
// A library to pass session data between two servers on the same subdomain:

// A function to convert a session into a cookie:
function session_2_cookie() {
    // Serialize, and base64 encode the session data:
    $output = base64_encode(serialize($_SESSION));
    
    // Now, send this as a cookie to our entire domain:
    setcookie('sessionpass', $output, false, '/', garner_subdomain());
}

// A function that will accept this cookie, and turn it back into a session
function cookie_2_session() {
    // Make sure that the session has started:
    @session_start();
    
    // Unserialize and unencode the cookie, saving it directly into
    //  the SESSION vars:
    $_SESSION = unserialize(base64_decode(@$_COOKIE['sessionpass']));
}

// A support function that will determine our subdomain for us without
//  having to know it:
function garner_subdomain() {
    // Explode the HOST into it's constituent parts:
    $parts = explode('.', $_SERVER['HTTP_HOST']);
    $cp = count($parts);

    // If a 1 part hostname like 'localhost' don't bother with a subdomain:
    if ($cp == 1) { $subdomain = ''; }
    // Otherwise, generate our subdomain by using the last 2 parts
    else { $subdomain = ".{$parts[$cp-2]}.{$parts[$cp-1]}"; }

    return $subdomain;
}

// Quick test:
// If GET next doesn't exist, then create a blank session, and add a value:
if (!(isset($_GET['next']))) {
    // Start the session
    session_start();
    
    // Blow away the current values:
    $_SESSION = array();
    
    // Add a single value:
    $_SESSION['test'] = 'Hello World';

    // Now convert the session into a cookie:
    session_2_cookie();

    // Now for testing, redirect immediately back to the same webpage:
    header("Location: {$_SERVER['PHP_SELF']}?next=true");
} else {
    // We are in the redirected mode, pretend to be a different server:
    // Convert the cookie back into a session:
    cookie_2_session();

    // And now output the value from it:
    echo "<p>{$_SESSION['test']}</p>";
}
?>