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Bibliographic Details
Main Author:	Carmen Heedy Martínez Uribe
Format:	Artículo científico
Language:	es
Published:	Pontificia Universidad Católica del Perú 2008
Subjects:	Educación TIC learning Educación a distancia educación virtual y e
Online Access:	https://www.redalyc.org/articulo.oa?id=717876772001
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La educación a distancia: sus características y necesidad en la educación actual Carmen Heedy Martínez Uribe Educación TIC learning Educación a distancia educación virtual y e El presente artículo destaca la relevancia de la educación a distancia mediante la identificación de sus características, y haciendo referencia a las diferencias existentes con la educación presencial. Del mismo modo, precisa los conceptos de educación virtual y e-learning, y aborda el rol e importancia de las tecnologías de la información y las comunicaciones (TIC) en esta modalidad educativa. Por otro lado, el texto incide en reconocer los alcances de esta modalidad en el ámbito de la educación superior. 2008 artículo científico 1019-9403 https://www.redalyc.org/articulo.oa?id=717876772001 es http://www.redalyc.org/revista.oa?id=7178 Educación application/pdf Pontificia Universidad Católica del Perú Educación (Perú) Num.33 Vol.17

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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