PHP unset_cache_flag函數代碼示例

/**
 * Set a volatile flag
 *
 * @param string $type the "type" namespace for the key
 * @param string $name the key to set
 * @param string $value the value to set (without magic quotes) - null will remove the flag
 * @param int $expiry (optional) epoch indicating expiry - defaults to now()+ 24hs
 * @return bool Always returns true
 */
function set_cache_flag($type, $name, $value, $expiry = null)
{
    global $DB;
    $timemodified = time();
    if ($expiry === null || $expiry < $timemodified) {
        $expiry = $timemodified + 24 * 60 * 60;
    } else {
        $expiry = (int) $expiry;
    }
    if ($value === null) {
        unset_cache_flag($type, $name);
        return true;
    }
    if ($f = $DB->get_record('cache_flags', array('name' => $name, 'flagtype' => $type), '*', IGNORE_MULTIPLE)) {
        // This is a potential problem in DEBUG_DEVELOPER.
        if ($f->value == $value and $f->expiry == $expiry and $f->timemodified == $timemodified) {
            return true;
            // No need to update.
        }
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        $DB->update_record('cache_flags', $f);
    } else {
        $f = new stdClass();
        $f->flagtype = $type;
        $f->name = $name;
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        $DB->insert_record('cache_flags', $f);
    }
    return true;
}

 /**
  * Find the session set by ntlmsso_magic(), validate it and
  * call authenticate_user_login() to authenticate the user through
  * the auth machinery.
  *
  * It is complemented by a similar check in user_login().
  *
  * If it succeeds, it never returns.
  *
  */
 function ntlmsso_finish()
 {
     global $CFG, $USER, $SESSION;
     $key = sesskey();
     $cf = get_cache_flags($this->pluginconfig . '/ntlmsess');
     if (!isset($cf[$key]) || $cf[$key] === '') {
         return false;
     }
     $username = $cf[$key];
     // Here we want to trigger the whole authentication machinery
     // to make sure no step is bypassed...
     $user = authenticate_user_login($username, $key);
     if ($user) {
         complete_user_login($user);
         // Cleanup the key to prevent reuse...
         // and to allow re-logins with normal credentials
         unset_cache_flag($this->pluginconfig . '/ntlmsess', $key);
         // Redirection
         if (user_not_fully_set_up($USER)) {
             $urltogo = $CFG->wwwroot . '/user/edit.php';
             // We don't delete $SESSION->wantsurl yet, so we get there later
         } else {
             if (isset($SESSION->wantsurl) and strpos($SESSION->wantsurl, $CFG->wwwroot) === 0) {
                 $urltogo = $SESSION->wantsurl;
                 // Because it's an address in this site
                 unset($SESSION->wantsurl);
             } else {
                 // No wantsurl stored or external - go to homepage
                 $urltogo = $CFG->wwwroot . '/';
                 unset($SESSION->wantsurl);
             }
         }
         // We do not want to redirect if we are in a PHPUnit test.
         if (!PHPUNIT_TEST) {
             redirect($urltogo);
         }
     }
     // Should never reach here.
     return false;
 }

/**
 * Set a volatile flag
 *
 * @param string $type the "type" namespace for the key
 * @param string $name the key to set
 * @param string $value the value to set (without magic quotes) - NULL will remove the flag
 * @param int $expiry (optional) epoch indicating expiry - defaults to now()+ 24hs
 * @return bool
 */
function set_cache_flag($type, $name, $value, $expiry = NULL)
{
    $timemodified = time();
    if ($expiry === NULL || $expiry < $timemodified) {
        $expiry = $timemodified + 24 * 60 * 60;
    } else {
        $expiry = (int) $expiry;
    }
    if ($value === NULL) {
        return unset_cache_flag($type, $name);
    }
    $type = addslashes($type);
    $name = addslashes($name);
    if ($f = get_record('cache_flags', 'name', $name, 'flagtype', $type)) {
        // this is a potentail problem in DEBUG_DEVELOPER
        if ($f->value == $value and $f->expiry == $expiry and $f->timemodified == $timemodified) {
            return true;
            //no need to update; helps rcache too
        }
        $f->value = addslashes($value);
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        return update_record('cache_flags', $f);
    } else {
        $f = new object();
        $f->flagtype = $type;
        $f->name = $name;
        $f->value = addslashes($value);
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        return (bool) insert_record('cache_flags', $f);
    }
}

/**
 * Set a volatile flag
 *
 * @param string $type the "type" namespace for the key
 * @param string $name the key to set
 * @param string $value the value to set (without magic quotes) - NULL will remove the flag
 * @param int $expiry (optional) epoch indicating expiry - defaults to now()+ 24hs
 * @return bool
 */
function set_cache_flag($type, $name, $value, $expiry = NULL)
{
    $timemodified = time();
    if ($expiry === NULL || $expiry < $timemodified) {
        $expiry = $timemodified + 24 * 60 * 60;
    } else {
        $expiry = (int) $expiry;
    }
    if ($value === NULL) {
        return unset_cache_flag($type, $name);
    }
    $type = addslashes($type);
    $name = addslashes($name);
    $value = addslashes($value);
    if ($f = get_record('cache_flags', 'name', $name, 'flagtype', $type)) {
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        return update_record('cache_flags', $f);
    } else {
        $f = new StdClass();
        $f->flagtype = $type;
        $f->name = $name;
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        return insert_record('cache_flags', $f);
    }
}

 /**
  * Find the session set by ntlmsso_magic(), validate it and 
  * call authenticate_user_login() to authenticate the user through
  * the auth machinery.
  * 
  * It is complemented by a similar check in user_login().
  * 
  * If it succeeds, it never returns. 
  *
  */
 function ntlmsso_finish()
 {
     global $CFG, $USER, $SESSION;
     $key = sesskey();
     $cf = get_cache_flags('auth/ldap/ntlmsess');
     if (!isset($cf[$key]) || $cf[$key] === '') {
         return false;
     }
     $username = $cf[$key];
     // Here we want to trigger the whole authentication machinery
     // to make sure no step is bypassed...
     $user = authenticate_user_login($username, $key);
     if ($user) {
         add_to_log(SITEID, 'user', 'login', "view.php?id={$USER->id}&course=" . SITEID, $user->id, 0, $user->id);
         $USER = complete_user_login($user);
         // Cleanup the key to prevent reuse...
         // and to allow re-logins with normal credentials
         unset_cache_flag('auth/ldap/ntlmsess', $key);
         /// Redirection
         if (user_not_fully_set_up($USER)) {
             $urltogo = $CFG->wwwroot . '/user/edit.php';
             // We don't delete $SESSION->wantsurl yet, so we get there later
         } else {
             if (isset($SESSION->wantsurl) and strpos($SESSION->wantsurl, $CFG->wwwroot) === 0) {
                 $urltogo = $SESSION->wantsurl;
                 /// Because it's an address in this site
                 unset($SESSION->wantsurl);
             } else {
                 // no wantsurl stored or external - go to homepage
                 $urltogo = $CFG->wwwroot . '/';
                 unset($SESSION->wantsurl);
             }
         }
         redirect($urltogo);
     }
     // Should never reach here.
     return false;
 }

/**
 * Set a volatile flag
 *
 * @param string $type the "type" namespace for the key
 * @param string $name the key to set
 * @param string $value the value to set (without magic quotes) - NULL will remove the flag
 * @param int $expiry (optional) epoch indicating expiry - defaults to now()+ 24hs
 * @return bool
 */
function set_cache_flag($type, $name, $value, $expiry = NULL)
{
    global $DB;
    $timemodified = time();
    if ($expiry === NULL || $expiry < $timemodified) {
        $expiry = $timemodified + 24 * 60 * 60;
    } else {
        $expiry = (int) $expiry;
    }
    if ($value === NULL) {
        unset_cache_flag($type, $name);
        return true;
    }
    if ($f = $DB->get_record('cache_flags', array('name' => $name, 'flagtype' => $type))) {
        // this is a potentail problem in DEBUG_DEVELOPER
        if ($f->value == $value and $f->expiry == $expiry and $f->timemodified == $timemodified) {
            return true;
            //no need to update; helps rcache too
        }
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        $DB->update_record('cache_flags', $f);
    } else {
        $f = new object();
        $f->flagtype = $type;
        $f->name = $name;
        $f->value = $value;
        $f->expiry = $expiry;
        $f->timemodified = $timemodified;
        $DB->insert_record('cache_flags', $f);
    }
    return true;
}