So You're Considering a Security System.

Fuente: ERIC Institute of Education Sciences

Salvato in:

Dettagli Bibliografici
Autore principale:	Klasing, Jane P.
Natura:	Recurso educativo Open Access
Lingua:	en
Pubblicazione:	1979
Soggetti:	Audiovisual Centers Books Educational Media Educational Research Electrical Systems Learning Resources Centers Media Specialists Research Reviews (Publications) School Planning Stealing
Accesso online:	Acceder al recurso
Tags:	Aggiungi Tag Nessun Tag, puoi essere il primo ad aggiungerne!!

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author	Klasing, Jane P.
author_facet	Klasing, Jane P. Klasing, Jane P.
collection	Education Resources Information Center
contents	So You're Considering a Security System. Klasing, Jane P. Audiovisual Centers Books Educational Media Educational Research Electrical Systems Learning Resources Centers Media Specialists Research Reviews (Publications) School Planning Stealing Library journals are inundated with articles pertinent to the installation of electric security systems, but few relate directly to school media programs. School media specialists should use available studies and contribute to the available research to insure effective decision making about adopting appropriate security measures. (CMV)
format	Recurso educativo Open Access
id	eric_EJ206886
institution	ERIC Institute of Education Sciences
language	en
publishDate	1979
record_format	eric
spellingShingle	So You're Considering a Security System. Klasing, Jane P. Audiovisual Centers Books Educational Media Educational Research Electrical Systems Learning Resources Centers Media Specialists Research Reviews (Publications) School Planning Stealing So You're Considering a Security System. Klasing, Jane P. Audiovisual Centers Books Educational Media Educational Research Electrical Systems Learning Resources Centers Media Specialists Research Reviews (Publications) School Planning Stealing Library journals are inundated with articles pertinent to the installation of electric security systems, but few relate directly to school media programs. School media specialists should use available studies and contribute to the available research to insure effective decision making about adopting appropriate security measures. (CMV)
title	So You're Considering a Security System.
topic	Audiovisual Centers Books Educational Media Educational Research Electrical Systems Learning Resources Centers Media Specialists Research Reviews (Publications) School Planning Stealing
url	https://eric.ed.gov/?id=EJ206886

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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