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Bibliographic Details
Main Author:	Heriberto Gómez R.
Format:	Artículo científico
Language:	es
Published:	Universidad de los Andes 2006
Subjects:	Política Fronteras Sensores Remotos Sistemas de Información Geográfica
Online Access:	https://www.redalyc.org/articulo.oa?id=54302009
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SIG: un arma para la frontera Heriberto Gómez R. Rosalba Linares Política Fronteras Sensores Remotos Sistemas de Información Geográfica Los Sistemas de Información Geográfica (SIG) constituyen una herramienta moderna para el análisisespacial. Sus bondades permiten la manipulación de datos de diferentes fuentes y en cantidades casiinfinitas por lo que su aplicación actual y potencial en los estudios de los espacios fronterizos es pertinente.Este trabajo persigue destacar las características del SIG así como una revisión ajustada de la aplicaciónde estos sistemas tanto para algunos casos concretos y otros sugeridos a fin de demostrar la versatilidadde esta herramienta y sus posibilidades de uso para entender con mayor propiedad la realidad fronteriza;lo cual coadyuva a solucionar los problemas inherentes a la misma. 2006 artículo científico 1316-6727 https://www.redalyc.org/articulo.oa?id=54302009 es http://www.redalyc.org/revista.oa?id=543 Aldea Mundo application/pdf Universidad de los Andes Aldea Mundo (República Bolivariana de Venezuela) Num.20 Vol.11

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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