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phpgmailimap

imap_search SINCE criterion never returns results

I am trying to access Gmail accounts to import Sent and Received Mails in a PHP application. After each import, I store the current date in order to not import all mail each time.

// $this->dateLastSynchro is a DateTime object
$searchCriteria = 'NEW UNDELETED SINCE "' . $this->dateLastSynchro->format('r') . '" ';
$return = imap_search($this->mailBoxHandle, $searchCriteria);

The first import works fine (when I use "ALL UNDELETED"), but when I use SINCE, I never have results (even if I have sent or received new mails).

I have tried to use the format Y-m-d for date, but I have a PHP Notice when I do this (it says something like Unrecognized criterion).

Thanks for help.

EDIT

Solution suggested by Max works fine but I can't accept answer because it's a comment.

Solution

  • Perhaps you should store the last UID you got. UIDs are guaranteed to increase as messages are added to the mailbox.