imap_delete not working

I am using php imap functions to parse the message from webmail. I can fetch messages one by one and save them in DB. After saving, I want to delete the inbox message. imap_delete function is not working here. My code is like that:

$connection = pop3_login($host,$port,$user,$pass,$folder="INBOX",$ssl=false);//connect
$stat = pop3_list($connection);//list messages

foreach($stat as $line) {
  //save in db开发者_如何学Go codes...
  imap_delete($connection, $line['msgno']);//flag as delete
}

imap_close($connection, CL_EXPUNGE);

I also tested - imap_expunge($connection);

But it is not working. The messages are not deleted. Please help me out...

You are mixing POP and IMAP.

That is not going to work. You need to open the connection with IMAP. See this example:

<?php

$mbox = imap_open("{imap.example.org}INBOX", "username", "password")
    or die("Can't connect: " . imap_last_error());

$check = imap_mailboxmsginfo($mbox);
echo "Messages before delete: " . $check->Nmsgs . "<br />\n";

imap_delete($mbox, 1);

$check = imap_mailboxmsginfo($mbox);
echo "Messages after  delete: " . $check->Nmsgs . "<br />\n";

imap_expunge($mbox);

$check = imap_mailboxmsginfo($mbox);
echo "Messages after expunge: " . $check->Nmsgs . "<br />\n";

imap_close($mbox);
?>

Actually the functions names are like pop3. but they perform imap functionality. like -

function pop3_login($host,$port,$user,$pass,$folder="INBOX",$ssl=false)
{
    $ssl=($ssl==false)?"/novalidate-cert":"";
    return (imap_open("{"."$host:$port/pop3$ssl"."}$folder",$user,$pass));
}
function pop3_list($connection,$message="")
{
    if ($message)
    {
        $range=$message;
    } else {
        $MC = imap_check($connection);
        $range = "1:".$MC->Nmsgs;
    }
    $response = imap_fetch_overview($connection,$range);
    foreach ($response as $msg) $result[$msg->msgno]=(array)$msg;
        return $result;
}