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Main Author:	Miquel -Àngel Garcia-López
Format:	Artículo científico
Language:	es
Published:	Fundación SEPI 2008
Subjects:	Economía y Finanzas dispersión policentrismo Suburbanización
Online Access:	https://www.redalyc.org/articulo.oa?id=17332103
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Quince años de suburbanización en la Barcelona metropolitana, ¿se está dispersando la población? Miquel -Àngel Garcia-López Economía y Finanzas dispersión policentrismo Suburbanización Diferentes estudios muestran que la estructura espacial de las ciudades generadiferentes efectos económicos, medioambientales y sociales. Maximizar lospositivos y minimizar los negativos requiere de un estudio exhaustivo de laforma urbana. Centrado en el caso de la Región Metropolitana de Barcelona(RMB) entre 1991 y 2005, en este trabajo se lleva a cabo un análisis estáticoy dinámico de su estructura espacial con el objetivo de caracterizar el procesode suburbanización de su población. En última instancia, se trata de analizarel impacto espacial de los cambios más recientes en la localización de lapoblación de la RMB. 2008 artículo científico 0210-1521 https://www.redalyc.org/articulo.oa?id=17332103 es http://www.redalyc.org/revista.oa?id=173 Investigaciones Económicas application/pdf Fundación SEPI Investigaciones Económicas (España) Num.1 Vol.XXXII

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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