0
我买了本书“PHP和MySql Web开发”（2008年10月），但不明白以下代码应该如何工作。这应该是首页并输出：
在php脚本中定义变量
但是，一旦加载，第一次错误发生在未定义的变量上。长脚本，相关章节是定义变量的起点。
<?php
// This file is the main body of the Warm Mail application.
// It works basically as a state machine and shows users the
// output for the action they have chosen.
//*****************************************************************************
// Stage 1: pre-processing
// Do any required processing before page header is sent
// and decide what details to show on page headers
//*****************************************************************************
include ('include_fns.php');
session_start();
//create short variable names
@$username = $_POST['username'];
@$passwd = $_POST['passwd'];
@$action = $_REQUEST['action'];
@$account = $_REQUEST['account'];
@$messageid = $_GET['messageid'];
@$to = $_POST['to'];
@$cc = $_POST['cc'];
@$subject = $_POST['subject'];
@$message = $_POST['message'];
@$buttons = array();
//append to this string if anything processed before header has output
$status = '';
// need to process log in or out requests before anything else
if ($username || $password) {
if(login($username, $passwd)) {
$status .= "<p style=\"padding-bottom: 100px\">Logged in successfully.</p>";
$_SESSION['auth_user'] = $username;
if(number_of_accounts($_SESSION['auth_user'])==1) {
$accounts = get_account_list($_SESSION['auth_user']);
$_SESSION['selected_account'] = $accounts[0];
}
} else {
$status .= "<p style=\"padding-bottom: 100px\">Sorry, we could not log you in with that
username and password.</p>";
}
}
if($action == 'log-out') {
session_destroy();
unset($action);
$_SESSION=array();
}
//need to process choose, delete or store account before drawing header
switch ($action) {
case 'delete-account':
delete_account($_SESSION['auth_user'], $account);
break;
case 'store-settings':
store_account_settings($_SESSION['auth_user'], $_POST);
break;
case 'select-account':
// if have chosen a valid account, store it as a session variable
if(($account) && (account_exists($_SESSION['auth_user'], $account))) {
$_SESSION['selected_account'] = $account;
}
break;
}
// set the buttons that will be on the tool bar
$buttons[0] = 'view-mailbox';
$buttons[1] = 'new-message';
$buttons[2] = 'account-setup';
//only offer a log out button if logged in
if(check_auth_user()) {
$buttons[4] = 'log-out';
}
//*****************************************************************************
// Stage 2: headers
// Send the HTML headers and menu bar appropriate to current action
//*****************************************************************************
if($action) {
// display header with application name and description of page or action
do_html_header($_SESSION['auth_user'], "Warm Mail - ".
format_action($action),
$_SESSION['selected_account']);
} else {
// display header with just application name
do_html_header($_SESSION['auth_user'], "Warm Mail",
$_SESSION['selected_account']);
}
display_toolbar($buttons);
//*****************************************************************************
// Stage 3: body
// Depending on action, show appropriate main body content
//*****************************************************************************
//display any text generated by functions called before header
echo $status;
if(!check_auth_user()) {
echo "<p>You need to log in";
if(($action) && ($action!='log-out')) {
echo " to go to ".format_action($action);
}
echo ".</p>";
display_login_form($action);
} else {
switch ($action) {
// if we have chosen to setup a new account, or have just added or
// deleted an account, show account setup page
case 'store-settings':
case 'account-setup':
case 'delete-account':
display_account_setup($_SESSION['auth_user']);
break;
case 'send-message':
if(send_message($to, $cc, $subject, $message)) {
echo "<p style=\"padding-bottom: 100px\">Message sent.</p>";
} else {
echo "<p style=\"padding-bottom: 100px\">Could not send message.</p>";
}
break;
case 'delete':
delete_message($_SESSION['auth_user'],
$_SESSION['selected_account'], $messageid);
//note deliberately no 'break' - we will continue to the next case
case 'select-account':
case 'view-mailbox':
// if mailbox just chosen, or view mailbox chosen, show mailbox
display_list($_SESSION['auth_user'],
$_SESSION['selected_account']);
break;
case 'show-headers':
case 'hide-headers':
case 'view-message':
// if we have just picked a message from the list, or were looking at
// a message and chose to hide or view headers, load a message
$fullheaders = ($action == 'show-headers');
display_message($_SESSION['auth_user'],
$_SESSION['selected_account'],
$messageid, $fullheaders);
break;
case 'reply-all':
//set cc as old cc line
if(!$imap) {
$imap = open_mailbox($_SESSION['auth_user'],
$_SESSION['selected_account']);
}
if($imap) {
$header = imap_header($imap, $messageid);
if($header->reply_toaddress) {
$to = $header->reply_toaddress;
} else {
$to = $header->fromaddress;
}
$cc = $header->ccaddress;
$subject = "Re: ".$header->subject;
$body = add_quoting(stripslashes(imap_body($imap, $messageid)));
imap_close($imap);
display_new_message_form($_SESSION['auth_user'],
$to, $cc, $subject, $body);
}
break;
case 'reply':
//set to address as reply-to or from of the current message
if(!$imap) {
$imap = open_mailbox($_SESSION['auth_user'],
$_SESSION['selected_account']);
}
if($imap) {
$header = imap_header($imap, $messageid);
if($header->reply_toaddress) {
$to = $header->reply_toaddress;
} else {
$to = $header->fromaddress;
}
$subject = "Re: ".$header->subject;
$body = add_quoting(stripslashes(imap_body($imap, $messageid)));
imap_close($imap);
display_new_message_form($_SESSION['auth_user'],
$to, $cc, $subject, $body);
}
break;
case 'forward':
//set message as quoted body of current message
if(!$imap) {
$imap = open_mailbox($_SESSION['auth_user'],
$_SESSION['selected_account']);
}
if($imap) {
$header = imap_header($imap, $messageid);
$body = add_quoting(stripslashes(imap_body($imap, $messageid)));
$subject = "Fwd: ".$header->subject;
imap_close($imap);
display_new_message_form($_SESSION['auth_user'],
$to, $cc, $subject, $body);
}
break;
case 'new-message':
display_new_message_form($_SESSION['auth_user'],
$to, $cc, $subject, $body);
break;
}
}
//*****************************************************************************
// Stage 4: footer
//*****************************************************************************
do_html_footer();
?>
我理解错误是由于$_POST是空的，因此不确定的变量，但为什么会这样写。 isthis代码错误或我缺少任何明显的东西。顺便说一句，include ('include_fns.php');不输出任何东西，只是一个函数列表。
您通常使用'isset（$ _ POST ['variableName']）'来避免这些类型的错误。 'isset（）'返回一个布尔值。阅读更多关于它[这里]（http://php.net/manual/en/function.isset.php） – simeg
我不能通过所有的代码，但我看到的第一件事是，你的第一个如果statment评估一个“$密码”变量，而你声明这样的变量为“$ passwd” – kos
这将有助于知道哪些变量未定义。发布这些值的表单在哪里？它在'include_fns.php'中吗？ – RST