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Bibliographic Details
Main Author:	Jorge Dehays
Format:	Artículo científico
Language:	es
Published:	Facultad Latinoamericana de Ciencias Sociales 2002
Subjects:	Sociología desastres desarrollo urbanización vulnerabilidad crecimiento demográfico
Online Access:	https://www.redalyc.org/articulo.oa?id=11502009
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Fenómenos naturales, concentración urbana y desastres en América Latina Jorge Dehays Sociología desastres desarrollo urbanización vulnerabilidad crecimiento demográfico En este trabajo se presenta un diagnóstico explicativo de lo que ha sucedido en América Latina en materia de desastres en los últimos 30 años. Para tal fin se adopta una perspectiva de análisis social, que tiene como argumento central los factores que configuran situaciones de riesgo y sobre todo de vulnerabilidad de la población, lo que permite entender la magnitud y recurrencia (frecuencia con la que ocurren) de las catástrofes de la región. La persistencia de la pobreza, la gran concentración de la población en las ciudades y los complejos problemas ambientales que la sociedad actual genera cotidianamente, entre otros, son algunos de los procesos considerados para el análisis. 2002 artículo científico 0188-7653 https://www.redalyc.org/articulo.oa?id=11502009 es http://www.redalyc.org/revista.oa?id=115 Perfiles Latinoamericanos application/pdf Facultad Latinoamericana de Ciencias Sociales Perfiles Latinoamericanos (México) Num.20

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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