note 101452 added to function.session-start

PHP locks the session file until it is closed. If you have 2 scripts using the same session (i.e. from the same user) then the 2nd script will not finish its call to session_start() until the first script finishes execution. If you have scripts that run for more than a second and users may be making more than 1 request at a time then it is worth calling session_write_close() as soon as you've finished writing session data. <?php // a lock is places on the session, so other scripts will have to wait session_start(); // do all your writing to $_SESSION $_SESSION['a'] = 1; // $_SESSION can still be read, but writing will not update the session. // the lock is removed and other scripts can now read the session session_write_close(); do_something_slow(); ?> Found this out from http://konrness.com/php5/how-to-prevent-blocking-php-requests/ ---- Server IP: 69.147.83.197 Probable Submitter: 213.208.116.72 ---- Manual Page -- http://www.php.net/manual/en/function.session-start.php Edit -- https://master.php.net/note/edit/101452 Del: integrated -- https://master.php.net/note/delete/101452/integrated Del: useless -- https://master.php.net/note/delete/101452/useless Del: bad code -- https://master.php.net/note/delete/101452/bad+code Del: spam -- https://master.php.net/note/delete/101452/spam Del: non-english -- https://master.php.net/note/delete/101452/non-english Del: in docs -- https://master.php.net/note/delete/101452/in+docs Del: other reasons-- https://master.php.net/note/delete/101452 Reject -- https://master.php.net/note/reject/101452 Search -- https://master.php.net/manage/user-notes.php