Read Mail Error using imap_open

hi all,

i have written code for access my inbox thourgh PHP, imap function available in PHP

the code as follows
---------------------------------------------------------------------------------------------
$MAIL_HOST="localhost";
$MAIL_USER="user";
$MAIL_PASS="pwd";

$inbox = imap_open ("{". $MAIL_HOST . ":143}INBOX", $MAIL_USER, $MAIL_PASS) or die("Error: unable to open mailbox");

$total = imap_num_msg($inbox);

for($x=$total; $x>0; $x--) {
      // get header and structure
      $headers = imap_header($inbox, $x);
      $structure = imap_fetchstructure($inbox, $x);
      htmlspecialchars($headers->fromaddress); // This is the FROM address
      foreach ($headers as $key => $value) {
            if (is_array($value)) $value = implode("\",\"", $value);
            echo $key . " = " . htmlspecialchars($value);
      }
}
// clean up
imap_close($inbox);
---------------------------------------------------------------------------------------------

When I execute above code, I get the below errors:

Warning: Couldn't open stream {localhost:143}INBOX in

/var/www/html/readinbox1.php on line 16 Error: unable to open mailbox

Warning: Certificate failure for localhost: self signed certificate:
/C=--/ST=SomeState/L=SomeCity/O=SomeOrganization/OU=SomeOrganizational
Unit/CN=localhost.localdomain/Email=root@localhost.localdomain (errflg=2) in
Unknown on line 0

How to solve this...Please help me....

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