(PHP 4, PHP 5, PHP 7, PHP 8)
imap_append — Append a string message to a specified mailbox
$imap,$folder,$message,$options = null,$internal_date = null
   Appends a string message to the specified folder. 
  
imapAn IMAP\Connection instance.
folderThe mailbox name, see imap_open() for more information
Passing untrusted data to this parameter is insecure, unless imap.enable_insecure_rsh is disabled.
messageThe message to be append, as a string
When talking to the Cyrus IMAP server, you must use "\r\n" as your end-of-line terminator instead of "\n" or the operation will fail
options
       If provided, the options will also be written
       to the folder
      
internal_dateIf this parameter is set, it will set the INTERNALDATE on the appended message. The parameter should be a date string that conforms to the rfc2060 specifications for a date_time value.
   Returns true on success or false on failure.
  
| Version | Description | 
|---|---|
| 8.1.0 | The imapparameter expects an IMAP\Connection
  instance now; previously, a validimapresource was expected. | 
| 8.0.0 | optionsandinternal_dateare now nullable. | 
Example #1 imap_append() example
<?php
$imap = imap_open("{imap.example.org}INBOX.Drafts", "username", "password");
$check = imap_check($imap);
echo "Msg Count before append: ". $check->Nmsgs . "\n";
imap_append($imap, "{imap.example.org}INBOX.Drafts"
                   , "From: me@example.com\r\n"
                   . "To: you@example.com\r\n"
                   . "Subject: test\r\n"
                   . "\r\n"
                   . "this is a test message, please ignore\r\n"
                   );
$check = imap_check($imap);
echo "Msg Count after append : ". $check->Nmsgs . "\n";
imap_close($imap);
?>