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Bibliographic Details
Main Author:	Félix Varela Parache
Format:	Artículo científico
Language:	es
Published:	Universidad Autónoma Metropolitana 2004
Subjects:	Economía y Finanzas regímenes cambiarios sistema Bretton Woods teoría de la bipolaridad
Online Access:	https://www.redalyc.org/articulo.oa?id=41304202
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Sistemas cambiarios: una visión desde la actualidad Félix Varela Parache Economía y Finanzas regímenes cambiarios sistema Bretton Woods teoría de la bipolaridad En los últimos años la evolución del sistema cambiario de los países más desarrollados seha orientado hacia una flotación acompañada de políticas monetarias regladas, ejercidas porbancos centrales independientes. En los países en desarrollo la solución es menos uniformey la teoría de la bipolaridad constituye una simplificación excesiva no suficientementerespaldada por la realidad o por la teoría. Algunos países emergentes, con mayor desarrolloeconómico e institucional, se encuentran en el camino de aprender a flotar, a semejanzade los países desarrollados. Para el resto, la mejor alternativa es un régimen cambiariointermedio, que tenga en cuenta la experiencia de las crisis recientes. 2004 artículo científico 0185-3937 https://www.redalyc.org/articulo.oa?id=41304202 es http://www.redalyc.org/revista.oa?id=413 Análisis Económico application/pdf Universidad Autónoma Metropolitana Análisis Económico (México) Num.42 Vol.XIX

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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