这是一段Web Mail的示范代码，功能不是很强，但是结构还比较完整，主要的功能如查看文件夹，查看信件，回复，写信都有。但是程序中没有考虑附件解读和发送的问题。 (原文在 这里)。仅推荐给希望了解Webmail编程的网友做个参考。更加完善的Webmail请大家到 这里查找。
请注意：程序中使用了http认证功能，此功能需配合apache服务器使用。

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将以下代码分别存为 index.php3, imapfuncs.phl
配置imapfuncs.phl文件中的$M_HOST = "localhost"; $M_MAILSERVER = "transit.fast.no";
然后浏览 index.php3 即可.
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index.php3

<?PHP
/ $Id: index.php3,v 1.3 1999/04/14 12:12:32 borud Exp $ /

/ load the IMAP library functions we\'ve written /
include("imapfuncs.phl");

m_login($m);

?>

elseif ($cmd == "display") {
m_display($n, $m);
}

elseif ($cmd == "compose" || $cmd == "reply") {
m_compose($n, $m);
}

elseif ($cmd == "send") {
m_send($to, $subject, $body);
m_list($m);
}

else {
m_list($m);
}
?>

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imapfuncs.phl

<?PHP / --C++-- /

/ $Id: imapfuncs.phl,v 1.4 1999/04/14 12:12:32 borud Exp $ /

/ configurable parameters /

$M_HOST = "localhost";
$M_MAILSERVER = "transit.fast.no\";

$M_COLOR_ODD = "#CCCCCC";
$M_COLOR_EVEN = "#EEEEEE";
$M_COLOR_HEAD = "#AAAAFF";
$M_COLOR_BG = "#FFFFFF";

/ globals /
$M_PORT = 143;
$M_SERVICE = "imap";
$M_SYSNAME = "Simple PHP3 IMAP Interface 1.0";
$M_MBOX = "{$M_HOST:$M_PORT/$M_SERVICE}";
$M_REALM = "IMAP Interface";
$MBOX = false;

/ functions /

function m_login ($mailbox = '')
{
global $MBOX, $M_REALM;
global $PHP_AUTH_USER, $PHP_AUTH_PW;

if ($MBOX) {
return true;
}

if (! $PHP_AUTH_USER) {
m_reject($M_REALM);
}

$MBOX = @imap_open(m_mailbox_name($mailbox), $PHP_AUTH_USER, $PHP_AUTH_PW);

if (! $MBOX) {
m_reject($M_REALM);
}

return true;
}

function m_list($mailbox = '')
{
global $MBOX, $PHP_SELF;
global $M_COLOR_ODD, $M_COLOR_EVEN, $M_COLOR_HEAD, $M_COLOR_BG;

/ if not logged into server, do so /
if (! $MBOX) {
if (! m_login($mailbox)) {
return false;
}
}

$num = imap_num_msg($MBOX);

echo "

return true;
}

function m_display($msgno, $mailbox = '')
{
global $MBOX, $M_COLOR_HEAD, $M_COLOR_BG;
global $PHP_SELF;

if (! $MBOX) {
if (! m_login($mailbox)) {
return false;
}
}

$struc = imap_fetchstructure($MBOX, $msgno);
if (! $struc) {
return false;
}

$head = imap_header($MBOX, $msgno, 50, 50, 0);

$from = $head->fromaddress;
$subj = $head->subject;
$date = $head->date;
$body = htmlentities(imap_body($MBOX, $msgno));

echo "

\n";

echo "From: $from\n";

echo "Subject: $subj\n";

echo "Date: $date\n";

echo "
\n";

echo "$body\n";

echo "

return true;
}

function m_delete ($msgno, $mailbox='')
{
global $MBOX;

if (is_array($msgno)) {
while (list($dummy, $num) = each($msgno)) {
imap_delete($MBOX, $num);
}
imap_expunge($MBOX);
} else {
return false;
}

return true;
}

function m_compose ($msgno='', $mailbox='')
{
global $MBOX, $M_COLOR_HEAD, $M_COLOR_BG;
global $PHP_SELF, $PHP_AUTH_USER, $M_MAILSERVER;

if ($msgno != '') {
$head = imap_header($MBOX, $msgno, 150, 150, 0);
$to = $head->fromaddress;
$subject = "Re: " . $head->subject;
$body = "$to wrote:\n";
$body .= ereg_replace("\n","\n>", "\n" . imap_body($MBOX, $msgno));
} else {
$to = "";
$subject = "";
$body = "";
}

echo "