PHP is_web_crawler函數代碼示例

 public function test_is_web_crawler()
 {
     $browsers = array('Mozilla/5.0 (Windows; U; MSIE 9.0; WIndows NT 9.0; en-US))', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:18.0) Gecko/18.0 Firefox/18.0', 'Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/412 (KHTML, like Gecko) Safari/412', 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_5; en-US) AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.215 Safari/534.10', 'Opera/9.0 (Windows NT 5.1; U; en)', 'Mozilla/5.0 (Linux; U; Android 2.1; en-us; Nexus One Build/ERD62) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17 –Nexus', 'Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5');
     $crawlers = array('Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)', 'Googlebot/2.1 (+http://www.googlebot.com/bot.html)', 'Googlebot-Image/1.0', 'Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)', 'Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)', 'Mozilla/5.0 (compatible; bingbot/2.0 +http://www.bing.com/bingbot.htm)', 'msnbot/2.1', 'Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)', 'Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)', 'AltaVista V2.0B crawler@evreka.com', 'ZoomSpider - wrensoft.com [ZSEBOT]', 'Baiduspider+(+http://www.baidu.com/search/spider_jp.html)', 'Baiduspider+(+http://www.baidu.com/search/spider.htm)', 'BaiDuSpider', 'User-Agent: Mozilla/2.0 (compatible; Ask Jeeves/Teoma)');
     foreach ($browsers as $agent) {
         $_SERVER['HTTP_USER_AGENT'] = $agent;
         $this->assertFalse(is_web_crawler());
     }
     foreach ($crawlers as $agent) {
         $_SERVER['HTTP_USER_AGENT'] = $agent;
         $this->assertTrue(is_web_crawler(), "{$agent} should be considered a search engine");
     }
 }

//.........這裏部分代碼省略.........
         }
         // Verify timeout first.
         $maxlifetime = $CFG->sessiontimeout;
         $timeout = false;
         if (isguestuser($userid) or empty($userid)) {
             // Ignore guest and not-logged in timeouts, there is very little risk here.
             $timeout = false;
         } else {
             if ($record->timemodified < time() - $maxlifetime) {
                 $timeout = true;
                 $authsequence = get_enabled_auth_plugins();
                 // Auths, in sequence.
                 foreach ($authsequence as $authname) {
                     $authplugin = get_auth_plugin($authname);
                     if ($authplugin->ignore_timeout_hook($_SESSION['USER'], $record->sid, $record->timecreated, $record->timemodified)) {
                         $timeout = false;
                         break;
                     }
                 }
             }
         }
         if ($timeout) {
             session_regenerate_id(true);
             $_SESSION = array();
             $DB->delete_records('sessions', array('id' => $record->id));
         } else {
             // Update session tracking record.
             $update = new \stdClass();
             $updated = false;
             if ($record->userid != $userid) {
                 $update->userid = $record->userid = $userid;
                 $updated = true;
             }
             $ip = getremoteaddr();
             if ($record->lastip != $ip) {
                 $update->lastip = $record->lastip = $ip;
                 $updated = true;
             }
             $updatefreq = empty($CFG->session_update_timemodified_frequency) ? 20 : $CFG->session_update_timemodified_frequency;
             if ($record->timemodified == $record->timecreated) {
                 // Always do first update of existing record.
                 $update->timemodified = $record->timemodified = time();
                 $updated = true;
             } else {
                 if ($record->timemodified < time() - $updatefreq) {
                     // Update the session modified flag only once every 20 seconds.
                     $update->timemodified = $record->timemodified = time();
                     $updated = true;
                 }
             }
             if ($updated) {
                 $update->id = $record->id;
                 $DB->update_record('sessions', $update);
             }
             return;
         }
     } else {
         if ($record) {
             // This happens when people switch session handlers...
             session_regenerate_id(true);
             $_SESSION = array();
             $DB->delete_records('sessions', array('id' => $record->id));
         }
     }
     unset($record);
     $timedout = false;
     if (!isset($_SESSION['SESSION'])) {
         $_SESSION['SESSION'] = new \stdClass();
         if (!$newsid) {
             $timedout = true;
         }
     }
     $user = null;
     if (!empty($CFG->opentogoogle)) {
         if (is_web_crawler()) {
             $user = guest_user();
         }
         if (!empty($CFG->guestloginbutton) and !$user and !empty($_SERVER['HTTP_REFERER'])) {
             // Automatically log in users coming from search engine results.
             if (strpos($_SERVER['HTTP_REFERER'], 'google') !== false) {
                 $user = guest_user();
             } else {
                 if (strpos($_SERVER['HTTP_REFERER'], 'altavista') !== false) {
                     $user = guest_user();
                 }
             }
         }
     }
     // Setup $USER and insert the session tracking record.
     if ($user) {
         self::set_user($user);
         self::add_session_record($user->id);
     } else {
         self::init_empty_session();
         self::add_session_record(0);
     }
     if ($timedout) {
         $_SESSION['SESSION']->has_timed_out = true;
     }
 }

 /**
  * Initialise $USER object, handles google access
  * and sets up not logged in user properly.
  *
  * @return void
  */
 protected function check_user_initialised()
 {
     global $CFG;
     if (isset($_SESSION['USER']->id)) {
         // already set up $USER
         return;
     }
     $user = null;
     if (!empty($CFG->opentogoogle) and !NO_MOODLE_COOKIES) {
         if (is_web_crawler()) {
             $user = guest_user();
         }
         if (!empty($CFG->guestloginbutton) and !$user and !empty($_SERVER['HTTP_REFERER'])) {
             // automaticaly log in users coming from search engine results
             if (strpos($_SERVER['HTTP_REFERER'], 'google') !== false) {
                 $user = guest_user();
             } else {
                 if (strpos($_SERVER['HTTP_REFERER'], 'altavista') !== false) {
                     $user = guest_user();
                 }
             }
         }
     }
     if (!$user) {
         $user = new stdClass();
         $user->id = 0;
         // to enable proper function of $CFG->notloggedinroleid hack
         if (isset($CFG->mnet_localhost_id)) {
             $user->mnethostid = $CFG->mnet_localhost_id;
         } else {
             $user->mnethostid = 1;
         }
     }
     session_set_user($user);
 }

    case 'posts' :
        $searchterms = array('userid:'.$user->id);
        $extrasql = '';
        break;

    default:
        $searchterms = array('userid:'.$user->id);
        $extrasql = 'AND p.parent = 0';
        break;
}

echo '<div class="user-content">';

if ($course->id == SITEID) {
    $searchcourse = SITEID;
    if (empty($CFG->forceloginforprofiles) or (isloggedin() and !isguestuser() and !is_web_crawler())) {
        // Search throughout the whole site.
        $searchcourse = 0;
    }
} else {
    // Search only for posts the user made in this course.
    $searchcourse = $course->id;
}

// Get the posts.
if ($posts = forum_search_posts($searchterms, $searchcourse, $page*$perpage, $perpage, $totalcount, $extrasql)) {

    require_once($CFG->dirroot.'/rating/lib.php');

    $baseurl = new moodle_url('user.php', array('id' => $user->id, 'course' => $course->id, 'mode' => $mode, 'perpage' => $perpage));
    echo $OUTPUT->paging_bar($totalcount, $page, $perpage, $baseurl);