phpcms中index.php中這段程式碼有何意義？

<code>if (strpos($_SERVER["REQUEST_URI"], "/CHA")===0 ) {
    $end = strpos($_SERVER["REQUEST_URI"], "/", 1);
    $channel = substr($_SERVER["REQUEST_URI"], 1, $end-1);
    $channelConfig = pc_base::load_config('channel');
    if ( !empty($channel) && isset($channelConfig[$channel]) ) {
        setcookie("channel", $channel, time()+7*86400, "/");
    }
}

</code>

phpcms中index.php裡的這段程式碼我懂程式碼意思，但不知道這樣有何意義，是不是phpcms裡面一般都這樣？

回覆內容：

<code>if (strpos($_SERVER["REQUEST_URI"], "/CHA")===0 ) {
    $end = strpos($_SERVER["REQUEST_URI"], "/", 1);
    $channel = substr($_SERVER["REQUEST_URI"], 1, $end-1);
    $channelConfig = pc_base::load_config('channel');
    if ( !empty($channel) && isset($channelConfig[$channel]) ) {
        setcookie("channel", $channel, time()+7*86400, "/");
    }
}

</code>

phpcms中index.php裡的這段程式碼我懂程式碼意思，但不知道這樣有何意義，是不是phpcms裡面一般都這樣？