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John Allen Paulos

John Allen Paulos (born July 4, 1945) is an American professor of mathematics at Temple University in Philadelphia, Pennsylvania. He has gained fame as a writer and speaker on mathematics and the importance of mathematical literacy. Paulos writes about many subjects, especially of the dangers of mathematical innumeracy; that is, the layperson's misconceptions about numbers, probability, and logic. Provided by Wikipedia

Een wiskundige op de beurs

by Paulos, John Allen, Bosch, Peter van den, Jonker, Henk
Published 2004

Boek

Whoops! There was an error.

Whoops \ Exception \ ErrorException (E_WARNING)

fopen(/tmp/vufind_sessions/sess_d9tlbj87sbbbdr05c9p81o23jt): failed to open stream: No space left on device

Whoops\Exception\ErrorException thrown with message "fopen(/tmp/vufind_sessions/sess_d9tlbj87sbbbdr05c9p81o23jt): failed to open stream: No space left on device" Stacktrace: #5 Whoops\Exception\ErrorException in /usr/local/vufind/module/VuFind/src/VuFind/Session/File.php:153 #4 fopen in /usr/local/vufind/module/VuFind/src/VuFind/Session/File.php:153 #3 VuFind\Session\File:saveSession in /usr/local/vufind/module/VuFind/src/VuFind/Session/AbstractBase.php:195 #2 VuFind\Session\AbstractBase:write in [internal]:0 #1 session_write_close in /usr/local/vufind/vendor/zendframework/zend-session/src/SessionManager.php:236 #0 Zend\Session\SessionManager:writeClose in [internal]:0

Stack frames (6)

Whoops\Exception\ErrorException

…/module/VuFind/src/VuFind/Session/File.php153

fopen

…/module/VuFind/src/VuFind/Session/File.php153

VuFind\Session\File saveSession

…/module/VuFind/src/VuFind/Session/AbstractBase.php195

VuFind\Session\AbstractBase write

[internal]0

session_write_close

…/vendor/zendframework/zend-session/src/SessionManager.php236

Zend\Session\SessionManager writeClose

[internal]0

/usr/local/vufind/module/VuFind/src/VuFind/Session/File.php

        foreach (glob($this->getPath() . "/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 $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    protected function saveSession($sess_id, $data)
    {
        $sess_file = $this->getPath() . '/sess_' . $sess_id;
        if ($fp = fopen($sess_file, "w")) {
            $return = fwrite($fp, $data);
            fclose($fp);
            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 ' . $sess_file . "\n";
        return false;
    }
}

/usr/local/vufind/module/VuFind/src/VuFind/Session/File.php

        foreach (glob($this->getPath() . "/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 $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    protected function saveSession($sess_id, $data)
    {
        $sess_file = $this->getPath() . '/sess_' . $sess_id;
        if ($fp = fopen($sess_file, "w")) {
            $return = fwrite($fp, $data);
            fclose($fp);
            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 ' . $sess_file . "\n";
        return false;
    }
}

/usr/local/vufind/module/VuFind/src/VuFind/Session/AbstractBase.php

        // 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 $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    public function write($sess_id, $data)
    {
        if ($this->writesDisabled) {
            return true;
        }
        return $this->saveSession($sess_id, $data);
    }
 
    /**
     * A function that is called internally when session data is to be saved.
     *
     * @param string $sess_id The current session ID
     * @param string $data    The session data to write
     *
     * @return bool
     */
    abstract protected function saveSession($sess_id, $data);
}

[internal]

/usr/local/vufind/vendor/zendframework/zend-session/src/SessionManager.php

     *
     * @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'

[internal]

Environment & details:

GET Data

Key	Value
author	Paulos, John Allen
lng	en

POST Data empty

Files empty

Key	Value
VUFIND_SESSION	d9tlbj87sbbbdr05c9p81o23jt
language	en

Session

Key	Value
__ZF	Array ( [_REQUEST_ACCESS_TIME] => 1747175849.1155 [_VALID] => Array ( [Zend\Session\Validator\Id] => d9tlbj87sbbbdr05c9p81o23jt ) )
SessionState	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( [cookiePath] => / ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )
Search	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( [last] => /eind/Author/Home?author=%22Paulos%2C+John+Allen%22&type=Author [params\|SolrAuthor\|hiddenFilters] => Array ( ) [params\|SolrAuthor\|limit] => 20 [params\|SolrAuthor\|sort] => [params\|SolrAuthor\|view] => list ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )
FlashMessenger	Zend\Stdlib\ArrayObject Object ( [storage:protected] => Array ( ) [flag:protected] => 2 [iteratorClass:protected] => ArrayIterator [protectedProperties:protected] => Array ( [0] => storage [1] => flag [2] => iteratorClass [3] => protectedProperties ) )

Server/Request Data

Key	Value
REDIRECT_VUFIND_ENV	development
REDIRECT_VUFIND_LOCAL_DIR	/usr/local/vufind/sites/eind
REDIRECT_VUFIND_LOCAL_MODULES	Brocade
REDIRECT_STATUS	200
VUFIND_ENV	development
VUFIND_LOCAL_DIR	/usr/local/vufind/sites/eind
VUFIND_LOCAL_MODULES	Brocade
HTTP_ACCEPT	/
HTTP_USER_AGENT	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
HTTP_COOKIE	VUFIND_SESSION=d9tlbj87sbbbdr05c9p81o23jt; language=en
HTTP_ACCEPT_ENCODING	gzip, br, zstd, deflate
HTTP_HOST	vufind2.brocade.uninova.nl
PATH	/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
SERVER_SIGNATURE	<address>Apache/2.4.29 (Ubuntu) Server at vufind2.brocade.uninova.nl Port 80</address>
SERVER_SOFTWARE	Apache/2.4.29 (Ubuntu)
SERVER_NAME	vufind2.brocade.uninova.nl
SERVER_ADDR	10.251.0.151
SERVER_PORT	80
REMOTE_ADDR	3.14.134.206
DOCUMENT_ROOT	/var/www/html
REQUEST_SCHEME	http
CONTEXT_PREFIX	/eind
CONTEXT_DOCUMENT_ROOT	/usr/local/vufind/public
SERVER_ADMIN	webmaster@localhost
SCRIPT_FILENAME	/usr/local/vufind/public/index.php
REMOTE_PORT	55564
REDIRECT_URL	/eind/Author/Home
REDIRECT_QUERY_STRING	author=Paulos%2C+John+Allen&lng=en
GATEWAY_INTERFACE	CGI/1.1
SERVER_PROTOCOL	HTTP/1.1
REQUEST_METHOD	GET
QUERY_STRING	author=Paulos%2C+John+Allen&lng=en
REQUEST_URI	/eind/Author/Home?author=Paulos%2C+John+Allen&lng=en
SCRIPT_NAME	/eind/index.php
PHP_SELF	/eind/index.php
REQUEST_TIME_FLOAT	1747175849.096
REQUEST_TIME	1747175849

Environment Variables empty

Registered Handlers

0. Whoops\Handler\PrettyPageHandler

John Allen Paulos

Related Subjects

Environment & details: