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Bibliographic Details
Main Authors:	GUSS, CAROLYN, RUFSVOLD, MARGERET I.
Format:	Recurso educativo Open Access
Language:	en
Published:	1967
Subjects:	Audiotape Recordings Audiovisual Aids Catalogs Educational Media Filmstrips Indexes Information Sources Instructional Films Kinescope Recordings Programed Instructional Materials Publications Teaching Machines Transparencies Videotape Recordings
Online Access:	https://eric.ed.gov/?id=ED018987
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GUIDES TO NEWER EDUCATIONAL MEDIA. SECOND EDITION. GUSS, CAROLYN RUFSVOLD, MARGERET I. Audiotape Recordings Audiovisual Aids Catalogs Educational Media Filmstrips Indexes Information Sources Instructional Films Kinescope Recordings Programed Instructional Materials Publications Teaching Machines Transparencies Videotape Recordings THIS IS AN INDEXED, ANNOTATED BIBLIOGRAPHY OF CATALOGS, LISTS, AND PERIODICALS, PROVIDING INFORMATION ABOUT SPECIAL EDUCATIONAL MATERIALS. THESE INCLUDE 16MM MOVIES, 35MM FILMSTRIPS, SLIDES, KINESCOPES AND VIDEO TAPES, PHONODISCS AND PHONOTAPES, TRANSPARENCIES, AND PROGRAMED INSTRUCTION MATERIALS. NOT INCLUDED ARE MATERIALS NOT REQUIRING SPECIAL EQUIPMENT FOR USE. ALSO EXCLUDED ARE TRADE AND PROMOTIONAL PUBLICATIONS, AND CATALOGS OF COLLECTIONS OF AUDIOVISUAL MATERIALS. PROFESSIONAL ORGANIZATIONS CONCERNED WITH NEWER MEDIA ARE LISTED WITH ADDRESSES AND DESCRIPTIONS. THIS DOCUMENT IS AVAILABLE FROM THE AMERICAN LIBRARY ASSOC., CHICAGO, ILL. (JM)

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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