PHP set mail to seen problem in IMAP server

Title, I want to read unread messages in IMAP server (Gmail), get their content and then set the message to read, but the Imap_setflag_full function doesn't seem to work. Can now read the content, but cannot set the content to seen, the code is as follows

$mbox = imap_open("{imap.gmail.com/imap/ssl/novalidate-cert}INBOX", "XXX@gmail.com", "XXX");try{    if($mbox){        //trouver les numéros de mails non-lus        $mails_unseen = imap_search($mbox, 'UNSEEN');        //print_r($mailunseen);        if (!empty($mails_unseen)){            //pour chaque mail non-lu            foreach($mails_unseen as $mail){                //pour les mail unipart                echo "hehe";                imap_setflag_full($mbox, $mail, "\\Seen \\Flagged", ST_UID);   //mettre état de mail à déjà-lu            }        }else{            throw new Exception("Pas de mail recent");        }        imap_close($mbox);    }else{        throw new Exception("Appel echoue");    }}catch(Exception $e){    echo 'Message: '.$e->getMessage().PHP_EOL; }

Has consulted an answer on the Stakoverflow http://stackoverflow.com/questions/6765736/set-an-mail-as-seen-on-imap-server

But it's still not working.

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Title, I want to read unread messages in IMAP server (Gmail), get their content and then set the message to read, but the Imap_setflag_full function doesn't seem to work. Can now read the content, but cannot set the content to seen, the code is as follows

$mbox = imap_open("{imap.gmail.com/imap/ssl/novalidate-cert}INBOX", "XXX@gmail.com", "XXX");try{    if($mbox){        //trouver les numéros de mails non-lus        $mails_unseen = imap_search($mbox, 'UNSEEN');        //print_r($mailunseen);        if (!empty($mails_unseen)){            //pour chaque mail non-lu            foreach($mails_unseen as $mail){                //pour les mail unipart                echo "hehe";                imap_setflag_full($mbox, $mail, "\\Seen \\Flagged", ST_UID);   //mettre état de mail à déjà-lu            }        }else{            throw new Exception("Pas de mail recent");        }        imap_close($mbox);    }else{        throw new Exception("Appel echoue");    }}catch(Exception $e){    echo 'Message: '.$e->getMessage().PHP_EOL; }

Has consulted an answer on the Stakoverflow http://stackoverflow.com/questions/6765736/set-an-mail-as-seen-on-imap-server

But it's still not working.

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