De l'inactivité chez les fourmis

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Détails bibliographiques
Publié dans:	Découverte No 365
Auteur principal:	Jeanson, Raphaël.
Support:	Article de revue
Langue:	Français
Publié:	2009.
Sujets:	Articles de périodiques
Résumé:	Depuis Jean de La Fontaine (1621-1695), les fourmis sont utilisées comme symbole d'un travail intense, et de nombreuses expressions populaires recourent à ces insectes pour illustrer une activité incessante. Cette réputation d'infatigables travailleuses n'est cependant pas fondée, les colonies de fourmis comprenant une proportion significative d'ouvrières inactives. Comment l'expliquer ?
Lien:	Dans: Découverte


LEADER	00836nam a22001817a 4500
001	289877
008	100401c2009 xx \|\|\| \|\|\|\| 00\| 0 fre d
041	0		\|a fre
100	1		\|a Jeanson, Raphaël.
245	1	5	\|a De l'inactivité chez les fourmis \|c Raphaël Jeanson.
260			\|c 2009.
300			\|a p. 44-49.
520			\|a Depuis Jean de La Fontaine (1621-1695), les fourmis sont utilisées comme symbole d'un travail intense, et de nombreuses expressions populaires recourent à ces insectes pour illustrer une activité incessante. Cette réputation d'infatigables travailleuses n'est cependant pas fondée, les colonies de fourmis comprenant une proportion significative d'ouvrières inactives. Comment l'expliquer ?
650			\|a Articles de périodiques
773	0		\|t Découverte \|g No 365
993			\|a Article de revue
994			\|a PS
997			\|0 289877

foreach (glob($this->path . "/sess_*") as $filename) { if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); } } return true; } /** * 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) { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, "w")) { $return = fwrite($handle, $data); fclose($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. echo 'Cannot write session to ' . $sessFile . "\n"; return false; } }

// 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 true; } /** * 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, $data) { if ($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); }

* * @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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De l'inactivité chez les fourmis

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