note 95012 added to function.imap-headerinfo

I'm not entirely sure why this is, but if you loop through all of the messages in a mailbox, calling imap_header() each time, you can significantly increase performance by calling imap_headers() first. Compare this: <?php $imap = imap_open("{my.server.com:143}INBOX", "user", "pass"); $n_msgs = imap_num_msg($imap); $s = microtime(true); for ($i=0; $i<$n_msgs; $i++) { $header = imap_header($imap, $i); } $e = microtime(true); echo ($e - $s); imap_close($imap); ?> With this: <?php $imap = imap_open("{my.server.com:143}INBOX", "user", "pass"); $n_msgs = imap_num_msg($imap); /****** adding this line: ******/ imap_headers($imap) /***************************/ $s = microtime(true); for ($i=0; $i<$n_msgs; $i++) { $header = imap_header($imap, $i); } $e = microtime(true); echo ($e - $s); imap_close($imap); ?> The performance difference, as I have tested on several boxes, connecting to several different servers, is that the second code snippet ALWAYS takes 1/2 the time, if not less. Perhaps it is because imap_headers() retrieves all of the messages on one connection, whereas imap_header() has to make a new fetch request for each message?? I'm not sure WHY it is faster if imap_headers() is called first, but I do know that it is, so I thought I'd pass on the knowledge. If anyone knows why this is, please let me know.... ---- Server IP: 69.147.83.197 Probable Submitter: 216.85.118.110 ---- Manual Page -- http://www.php.net/manual/en/function.imap-headerinfo.php Edit -- https://master.php.net/note/edit/95012 Del: integrated -- https://master.php.net/note/delete/95012/integrated Del: useless -- https://master.php.net/note/delete/95012/useless Del: bad code -- https://master.php.net/note/delete/95012/bad+code Del: spam -- https://master.php.net/note/delete/95012/spam Del: non-english -- https://master.php.net/note/delete/95012/non-english Del: in docs -- https://master.php.net/note/delete/95012/in+docs Del: other reasons-- https://master.php.net/note/delete/95012 Reject -- https://master.php.net/note/reject/95012 Search -- https://master.php.net/manage/user-notes.php