PHP SQL::strtotime方法代码示例

 /**
  * list images
  *
  * @param resource the SQL result
  * @return string the rendered text
  *
  * @see layouts/layout.php
  **/
 function layout($result)
 {
     global $context;
     // empty list
     if (!SQL::count($result)) {
         $output = array();
         return $output;
     }
     // we return an array of ($url => $attributes)
     $items = array();
     // process all items in the list
     while ($item = SQL::fetch($result)) {
         // get the anchor for this image
         if ($item['anchor']) {
             $anchor = Anchors::get($item['anchor']);
         }
         // url to view the image
         $url = $context['url_to_home'] . $context['url_to_root'] . Images::get_url($item['id']);
         // time of last update
         $time = SQL::strtotime($item['edit_date']);
         // the title as the label
         if ($item['title']) {
             $label = ucfirst($item['title']) . ' (' . $item['image_name'] . ')';
         } else {
             $label = $item['image_name'];
         }
         // the section
         $section = '';
         if (is_object($anchor)) {
             $section = ucfirst($anchor->get_title());
         }
         // the author(s) is an e-mail address, according to rss 2.0 spec
         $author = $item['create_address'] . ' (' . $item['create_name'] . ')';
         if ($item['create_address'] != $item['edit_address']) {
             if ($author) {
                 $author .= ', ';
             }
             $author .= $item['edit_address'] . ' (' . $item['edit_name'] . ')';
         }
         // the description
         $description = Codes::beautify($item['description']);
         // cap the number of words
         $description = Skin::cap($description, 300);
         // fix image references
         $description = preg_replace('#"/([^">]+?)"#', '"' . $context['url_to_home'] . '/$1"', $description);
         $introduction = $description;
         // other rss fields
         $extensions = array();
         // url for enclosure
         $type = Files::get_mime_type($item['image_name']);
         $extensions[] = '<enclosure url="' . $context['url_to_home'] . $context['url_to_root'] . Files::get_path($item['anchor'], 'images') . '/' . $item['image_name'] . '"' . ' length="' . $item['image_size'] . '"' . ' type="' . $type . '" />';
         // list all components for this item
         $items[$url] = array($time, $label, $author, $section, NULL, $introduction, $description, $extensions);
     }
     // end of processing
     SQL::free($result);
     return $items;
 }

 /**
  * list dates
  *
  * @param resource the SQL result
  * @return string the rendered text
  *
  * @see layouts/layout.php
  **/
 function layout($result)
 {
     global $context;
     // build the calendar
     $text = 'BEGIN:VCALENDAR' . CRLF . 'VERSION:2.0' . CRLF . 'PRODID:YACS' . CRLF . 'METHOD:PUBLISH' . CRLF;
     // organization, if any
     if (isset($context['site_name']) && $context['site_name']) {
         $text .= 'X-WR-CALNAME:' . $context['site_name'] . CRLF;
     }
     // process all items in the list
     while ($item = SQL::fetch($result)) {
         // one event at a time
         $text .= 'BEGIN:VEVENT' . CRLF;
         // the event spans limited time
         if (isset($item['duration']) && $item['duration']) {
             $text .= 'DTSTART:' . gmdate('Ymd\\THis\\Z', SQL::strtotime($item['date_stamp'])) . CRLF;
             $text .= 'DTEND:' . gmdate('Ymd\\THis\\Z', SQL::strtotime($item['date_stamp']) + $item['duration'] * 60) . CRLF;
             // a full-day event
         } else {
             $text .= 'DTSTART;VALUE=DATE:' . date('Ymd', SQL::strtotime($item['date_stamp'])) . CRLF;
             $text .= 'DTEND;VALUE=DATE:' . date('Ymd', SQL::strtotime($item['date_stamp']) + 86400) . CRLF;
         }
         // url to view the date
         $text .= 'URL:' . Articles::get_permalink($item) . CRLF;
         // organization, if any
         if (isset($item['introduction']) && $item['introduction']) {
             $text .= 'DESCRIPTION:' . str_replace(array("\n", "\r"), ' ', strip_tags($item['introduction'])) . CRLF;
         }
         // build a valid title
         if (isset($item['title']) && $item['title']) {
             $text .= 'SUMMARY:' . Codes::beautify_title($item['title']) . CRLF;
         }
         // required by Outlook 2003
         if (isset($item['id']) && $item['id']) {
             $text .= 'UID:' . $item['id'] . CRLF;
         }
         // date of creation
         if (isset($item['create_date']) && $item['create_date']) {
             $text .= 'CREATED:' . gmdate('Ymd\\THis\\Z', SQL::strtotime($item['create_date'])) . CRLF;
         }
         // date of last modification
         if (isset($item['edit_date']) && $item['edit_date']) {
             $text .= 'DTSTAMP:' . gmdate('Ymd\\THis\\Z', SQL::strtotime($item['edit_date'])) . CRLF;
         }
         // next event
         $text .= 'SEQUENCE:0' . CRLF . 'END:VEVENT' . CRLF;
     }
     // date of last update
     $text .= 'END:VCALENDAR' . CRLF;
     // end of processing
     SQL::free($result);
     return $text;
 }

 /**
  * list links
  *
  * @param resource the SQL result
  * @return array of resulting items, or NULL
  *
  * @see layouts/layout.php
  **/
 function layout($result)
 {
     global $context;
     // we return an array of ($url => $attributes)
     $items = array();
     // empty list
     if (!SQL::count($result)) {
         return $items;
     }
     // process all items in the list
     while ($item = SQL::fetch($result)) {
         // get the anchor for this link
         if ($item['anchor']) {
             $anchor = Anchors::get($item['anchor']);
         }
         // url is the link itself
         $url = $item['link_url'];
         // time of last update
         $time = SQL::strtotime($item['edit_date']);
         // the title as the label
         if ($item['title']) {
             $label = $item['title'];
         } else {
             $label = $url;
         }
         // the section
         $section = '';
         if (is_object($anchor)) {
             $section = ucfirst($anchor->get_title());
         }
         // the author(s) is an e-mail address, according to rss 2.0 spec
         $author = $item['edit_address'] . ' (' . $item['edit_name'] . ')';
         // the description
         $description = Codes::beautify($item['description']);
         // cap the number of words
         $description = Skin::cap($description, 300);
         // fix image references
         $description = preg_replace('#"/([^">]+?)"#', '"' . $context['url_to_home'] . '/$1"', $description);
         $introduction = $description;
         // other rss fields
         $extensions = array();
         // list all components for this item
         $items[$url] = array($time, $label, $author, $section, NULL, $introduction, $description, $extensions);
     }
     // end of processing
     SQL::free($result);
     return $items;
 }

 /**
  * list users
  *
  * @param resource the SQL result
  * @return string the rendered text
  *
  * @see layouts/layout.php
  **/
 function layout($result)
 {
     global $context;
     // empty list
     if (!SQL::count($result)) {
         $output = array();
         return $output;
     }
     // we return an array of ($url => $attributes)
     $items = array();
     // process all items in the list
     while ($item = SQL::fetch($result)) {
         // url to view the user profile
         $url = Users::get_permalink($item);
         // time of last update
         $time = SQL::strtotime($item['edit_date']);
         // item title
         if ($item['full_name']) {
             $label = ucfirst(Skin::strip($item['full_name'], 10));
         } else {
             $label = ucfirst(Skin::strip($item['nick_name'], 10));
         }
         // the section
         $section = '';
         // the author(s) is an e-mail address, according to rss 2.0 spec
         $author .= $item['edit_address'] . ' (' . $item['edit_name'] . ')';
         // introduction
         $introduction = Codes::beautify($item['introduction']);
         // the description
         $description = Codes::beautify($item['description']);
         // cap the number of words
         $description = Skin::cap($description, 300);
         // fix image references
         $description = preg_replace('#"/([^">]+?)"#', '"' . $context['url_to_home'] . '/$1"', $description);
         // other rss fields
         $extensions = array();
         // list all components for this item
         $items[$url] = array($time, $label, $author, $section, $icon, $introduction, $description, $extensions);
     }
     // end of processing
     SQL::free($result);
     return $items;
 }

//.........这里部分代码省略.........
             $query[] = "description = '" . SQL::escape($this->item['description'] . ' ' . $label) . "'";
         }
         // suppress references to a deleted file
     } elseif ($action == 'file:delete' && $origin) {
         // suppress reference in main description field
         $text = Codes::delete_embedded($this->item['description'], 'download', $origin);
         $text = Codes::delete_embedded($text, 'embed', $origin);
         $text = Codes::delete_embedded($text, 'file', $origin);
         // save changes
         $query[] = "description = '" . SQL::escape($text) . "'";
         // append a reference to a new image to the description
     } elseif ($action == 'image:create' && $origin) {
         if (!Codes::check_embedded($this->item['description'], 'image', $origin)) {
             // the overlay may prevent embedding
             if (is_object($this->overlay) && !$this->overlay->should_embed_files()) {
             } else {
                 // list has already started
                 if (preg_match('/\\[image=[^\\]]+?\\]\\s*$/', $this->item['description'])) {
                     $this->item['description'] .= ' [image=' . $origin . ']';
                 } else {
                     $this->item['description'] .= "\n\n" . '[image=' . $origin . ']';
                 }
                 $query[] = "description = '" . SQL::escape($this->item['description']) . "'";
             }
         }
         // also use it as thumnail if none has been defined yet
         if (!isset($this->item['thumbnail_url']) || !trim($this->item['thumbnail_url'])) {
             include_once $context['path_to_root'] . 'images/images.php';
             if (($image = Images::get($origin)) && ($url = Images::get_thumbnail_href($image))) {
                 $query[] = "thumbnail_url = '" . SQL::escape($url) . "'";
             }
         }
         // refresh stamp only if image update occurs within 6 hours after last edition
         if (SQL::strtotime($this->item['edit_date']) + 6 * 60 * 60 < time()) {
             $silently = TRUE;
         }
         // suppress a reference to an image that has been deleted
     } elseif ($action == 'image:delete' && $origin) {
         // suppress reference in main description field
         $query[] = "description = '" . SQL::escape(Codes::delete_embedded($this->item['description'], 'image', $origin)) . "'";
         // suppress references as icon and thumbnail as well
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 if ($this->item['icon_url'] == $url) {
                     $query[] = "icon_url = ''";
                 }
                 if ($this->item['thumbnail_url'] == $url) {
                     $query[] = "thumbnail_url = ''";
                 }
             }
             if ($url = Images::get_thumbnail_href($image)) {
                 if ($this->item['icon_url'] == $url) {
                     $query[] = "icon_url = ''";
                 }
                 if ($this->item['thumbnail_url'] == $url) {
                     $query[] = "thumbnail_url = ''";
                 }
             }
         }
         // set an existing image as the article icon
     } elseif ($action == 'image:set_as_icon' && $origin) {
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 $query[] = "icon_url = '" . SQL::escape($url) . "'";

//.........这里部分代码省略.........
         if ($label) {
             $query[] = "description = '" . SQL::escape($this->item['description'] . ' ' . $label) . "'";
         }
         // suppress references to a deleted file
     } elseif ($action == 'file:delete') {
         // suppress reference in main description field
         $text = Codes::delete_embedded($this->item['description'], 'download', $origin);
         $text = Codes::delete_embedded($text, 'embed', $origin);
         $text = Codes::delete_embedded($text, 'file', $origin);
         // save changes
         $query[] = "description = '" . SQL::escape($text) . "'";
         // append a reference to a new image to the description
     } elseif ($action == 'image:create') {
         if (!Codes::check_embedded($this->item['description'], 'image', $origin)) {
             // the overlay may prevent embedding
             if (is_object($this->overlay) && !$this->overlay->should_embed_files()) {
             } else {
                 // list has already started
                 if (preg_match('/\\[image=[^\\]]+?\\]\\s*$/', $this->item['description'])) {
                     $query[] = "description = '" . SQL::escape($this->item['description'] . ' [image=' . $origin . ']') . "'";
                 } else {
                     $query[] = "description = '" . SQL::escape($this->item['description'] . "\n\n" . '[image=' . $origin . ']') . "'";
                 }
             }
         }
         // also use it as thumnail if none has been defined yet
         if (!isset($this->item['thumbnail_url']) || !trim($this->item['thumbnail_url'])) {
             include_once $context['path_to_root'] . 'images/images.php';
             if (($image = Images::get($origin)) && ($url = Images::get_thumbnail_href($image))) {
                 $query[] = "thumbnail_url = '" . SQL::escape($url) . "'";
             }
         }
         // refresh stamp only if image update occurs within 6 hours after last edition
         if (SQL::strtotime($this->item['edit_date']) + 6 * 60 * 60 < time()) {
             $silently = TRUE;
         }
         // suppress a reference to an image that has been deleted
     } elseif ($action == 'image:delete') {
         // suppress reference in main description field
         $query[] = "description = '" . SQL::escape(Codes::delete_embedded($this->item['description'], 'image', $origin)) . "'";
         // suppress references as icon and thumbnail as well
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 if ($this->item['icon_url'] == $url) {
                     $query[] = "icon_url = ''";
                 }
                 if ($this->item['thumbnail_url'] == $url) {
                     $query[] = "thumbnail_url = ''";
                 }
             }
             if ($url = Images::get_thumbnail_href($image)) {
                 if ($this->item['icon_url'] == $url) {
                     $query[] = "icon_url = ''";
                 }
                 if ($this->item['thumbnail_url'] == $url) {
                     $query[] = "thumbnail_url = ''";
                 }
             }
         }
         // set an existing image as the section icon
     } elseif ($action == 'image:set_as_icon') {
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 $query[] = "icon_url = '" . SQL::escape($url) . "'";

 /**
  * wait for updates
  *
  * This script will wait for new updates before providing them to caller.
  * Because of potential time-outs, you have to care of retries.
  *
  * @param string reference to thread (e.g., 'article:123')
  * @param string timestamp of previous update
  * @return array attributes including new comments and a timestamp
  *
  * @see articles/view_as_chat.php
  * @see comments/thread.php
  */
 public static function &pull($anchor, $stamp, $count = 100)
 {
     global $context;
     $timer = 1;
     // some implementations will kill network connections earlier anyway
     Safe::set_time_limit(max(30, $timer));
     // we return formatted text
     $text = '';
     // sanity check
     if (!$anchor) {
         return $text;
     }
     // the query to get time of last update
     $query = "SELECT edit_date, edit_name FROM " . SQL::table_name('comments') . " AS comments " . " WHERE comments.anchor LIKE '" . SQL::escape($anchor) . "'" . " ORDER BY comments.edit_date DESC" . " LIMIT 1";
     // we may timeout ourself, to be safe with network resources
     while (!($stat = SQL::query_first($query)) || isset($stat['edit_date']) && $stat['edit_date'] <= $stamp) {
         // kill the request to avoid repeated transmissions when nothing has changed
         if (--$timer < 1) {
             http::no_content();
             die;
         }
         // preserve server resources
         sleep(1);
     }
     // return an array of variables
     $response = array();
     $response['items'] =& Comments::list_by_thread_for_anchor($anchor, 0, $count, 'thread');
     $response['name'] = strip_tags($stat['edit_name']);
     $response['timestamp'] = SQL::strtotime($stat['edit_date']);
     // return by reference
     return $response;
 }

     $details[] = EXPIRED_FLAG . ' ' . sprintf(i18n::s('Category has expired %s'), Skin::build_date($item['expiry_date']));
 }
 // display details, if any
 if (count($details)) {
     $context['page_details'] .= ucfirst(implode(BR, $details)) . BR;
 }
 // other details
 $details = array();
 // additional details for associates and editors
 if (Surfer::is_associate() || is_object($anchor) && $anchor->is_assigned()) {
     // the creator of this category
     if ($item['create_date']) {
         $details[] = sprintf(i18n::s('posted by %s %s'), Users::get_link($item['create_name'], $item['create_address'], $item['create_id']), Skin::build_date($item['create_date']));
     }
     // hide last edition if done by creator, and if less than 24 hours between creation and last edition
     if ($item['create_date'] && $item['create_id'] == $item['edit_id'] && SQL::strtotime($item['create_date']) + 24 * 60 * 60 >= SQL::strtotime($item['edit_date'])) {
     } else {
         if ($item['edit_action']) {
             $action = Anchors::get_action_label($item['edit_action']);
         } else {
             $action = i18n::s('edited');
         }
         $details[] = sprintf(i18n::s('%s by %s %s'), $action, Users::get_link($item['edit_name'], $item['edit_address'], $item['edit_id']), Skin::build_date($item['edit_date']));
     }
     // the number of hits
     if ($item['hits'] > 1) {
         $details[] = Skin::build_number($item['hits'], i18n::s('hits'));
     }
     // rank for this section
     if (intval($item['rank']) != 10000 && Surfer::is_associate()) {
         $details[] = '{' . $item['rank'] . '}';

 /**
  * list articles
  *
  * @param resource the SQL result
  * @return array
  *
  * @see layouts/layout.php
  **/
 function layout($result)
 {
     global $context;
     // we return an array of ($url => $attributes)
     $items = array();
     // empty list
     if (!SQL::count($result)) {
         return $items;
     }
     // process all items in the list
     while ($item = SQL::fetch($result)) {
         // get the related overlay, if any
         $overlay = Overlay::load($item, 'category:' . $item['id']);
         // get the anchor
         $anchor = Anchors::get($item['anchor']);
         // provide an absolute link
         $url = Categories::get_permalink($item);
         // build a title
         if (is_object($overlay)) {
             $title = Codes::beautify_title($overlay->get_text('title', $item));
         } else {
             $title = Codes::beautify_title($item['title']);
         }
         // time of last update
         $time = SQL::strtotime($item['edit_date']);
         // the section
         $root = '';
         if ($item['anchor'] && ($anchor = Anchors::get($item['anchor']))) {
             $root = ucfirst(trim(strip_tags(Codes::beautify_title($anchor->get_title()))));
         }
         // the icon to use
         $icon = '';
         if ($item['thumbnail_url']) {
             $icon = $item['thumbnail_url'];
         } elseif ($item['anchor'] && ($anchor = Anchors::get($item['anchor'])) && is_callable($anchor, 'get_bullet_url')) {
             $icon = $anchor->get_bullet_url();
         }
         if ($icon) {
             $icon = $context['url_to_home'] . $context['url_to_root'] . $icon;
         }
         // the author(s) is an e-mail address, according to rss 2.0 spec
         $author = '';
         if (isset($item['create_address'])) {
             $author .= $item['create_address'];
         }
         if (isset($item['create_name']) && trim($item['create_name'])) {
             $author .= ' (' . $item['create_name'] . ')';
         }
         if (isset($item['edit_address']) && trim($item['edit_address']) && $item['create_address'] != $item['edit_address']) {
             if ($author) {
                 $author .= ', ';
             }
             $author .= $item['edit_address'];
             if (isset($item['edit_name']) && trim($item['edit_name'])) {
                 $author .= ' (' . $item['edit_name'] . ')';
             }
         }
         // list all components for this item
         $items[$url] = array($time, $title, $author, $root, $icon, '', '', '');
     }
     // end of processing
     SQL::free($result);
     return $items;
 }

     // phone number, if any
     if (isset($agent['phone_number']) && $agent['phone_number']) {
         $text .= 'TEL;PREF:' . $agent['phone_number'] . "\r\n";
     }
     // alternate number, if any
     if (isset($agent['alternate_number']) && $agent['alternate_number']) {
         $text .= 'TEL;MSG:' . $agent['alternate_number'] . "\r\n";
     }
     // web mail, if any
     if (isset($agent['email']) && $agent['email']) {
         $text .= 'EMAIL;PREF;INTERNET:' . $agent['email'] . "\r\n";
     }
     $text .= 'END:VCARD' . "\r\n";
 }
 // date of last update
 $text .= 'REV:' . date('Ymd\\THis\\Z', SQL::strtotime($item['edit_date'])) . CRLF . 'END:VCARD' . CRLF;
 //
 // transfer to the user agent
 //
 // no encoding, no compression and no yacs handler...
 if (!headers_sent()) {
     Safe::header('Content-Type: text/x-vcard');
     Safe::header('Content-Transfer-Encoding: binary');
     Safe::header('Content-Length: ' . strlen($text));
 }
 // suggest a download
 if (!headers_sent()) {
     $file_name = utf8::to_ascii(Skin::strip($context['page_title']) . '.vcf');
     Safe::header('Content-Disposition: attachment; filename="' . str_replace('"', '', $file_name) . '"');
 }
 // enable 30-minute caching (30*60 = 1800), even through https, to help IE6 on download

 /**
  * process deferred messages
  *
  * Most often, the server has to stay below a given rate of messages,
  * for example 50 messages per hour.
  *
  * Of course, any lively community will feature bursts of activity and of
  * messages, therefore the need for a shaping mechanism.
  *
  * YACS implements a leaking bucket algorithm to take care of messages sent
  * previously:
  *
  * 1. Initially, the bucket is empty.
  *
  * 2. New messages are queued in the database, to be processed asynchronously.
  *
  * 3. On background ticks, the bucket is decremented. If the bucket becomes
  * empty, and if some messages have been queued, a couple of them are sent, and
  * the bucket is incremented accordingly.
  *
  * Bucket content is managed as value 'bucket.content' saved in the database.
  *
  * The bucket size is given by parameter $context['mail_hourly_maximum'], set
  * in the configuration panel for system parameters.
  *
  * This parameter has a default value of 50, meaning YACS will not send more
  * than 50 messages per hour.
  *
  * Background processing is either added to regular page generation or delegated
  * to an external sub-system (e.g., cron). In case of a large site, we recommend
  * to use the second solution, even if this adds additional setup steps. Your
  * choice will be recorded in the configuration panel for system parameters.
  *
  * @see control/configure.php
  *
  * The number of messages sent on each tick can go up to the bucket size if
  * background processing is external. Else it is one fourth of bucket size, to
  * minimize impact on watching surfer.
  *
  * @see cron.php
  */
 public static function tick_hook()
 {
     global $context;
     // email services have to be activated
     if (!isset($context['with_email']) || $context['with_email'] != 'Y') {
         return;
     }
     // useless if we don't have a valid database connection
     if (!$context['connection']) {
         return;
     }
     // remember start time
     $start = get_micro_time();
     // get bucket size --force it if set to 0
     if (!isset($context['mail_hourly_maximum']) || $context['mail_hourly_maximum'] < 5) {
         $context['mail_hourly_maximum'] = 50;
     }
     // get record related to last tick
     include_once $context['path_to_root'] . 'shared/values.php';
     $bucket = Values::get_record('mailer.bucket.content', 0);
     $bucket['value'] = intval($bucket['value']);
     // some content to leak
     if ($bucket['value'] > 0) {
         // date of last stamp
         if (isset($bucket['edit_date'])) {
             $stamp = SQL::strtotime($bucket['edit_date']);
         } else {
             $stamp = time() - 3600;
         }
         // leak is maximum after one hour
         $leak = intval($context['mail_hourly_maximum'] * (time() - $stamp) / 3600);
         // preserve previous value until actual leak
         if ($leak < 1) {
             return;
         }
         // actual leak
         $bucket['value'] = max(0, $bucket['value'] - $leak);
     }
     // process some messages only when bucket is empty
     $count = 0;
     if ($bucket['value'] < 1) {
         // reduced speed if on-line processing
         if (isset($_SERVER['REMOTE_ADDR'])) {
             $slice = intval($context['mail_hourly_maximum'] / 4);
         } else {
             $slice = intval($context['mail_hourly_maximum']);
         }
         // get some messages, if any
         $query = "SELECT * FROM " . SQL::table_name('messages') . " ORDER BY edit_date LIMIT 0, " . $slice;
         if ($result = SQL::query($query)) {
             // process every message
             while ($item = SQL::fetch($result)) {
                 Mailer::process($item['recipient'], $item['subject'], $item['message'], $item['headers']);
                 // purge the queue
                 $query = 'DELETE FROM ' . SQL::table_name('messages') . ' WHERE id = ' . $item['id'];
                 SQL::query($query);
                 // fill the bucket
                 $bucket['value'] += 1;
                 $count++;
//.........这里部分代码省略.........

 /**
  * remember the last action for this user
  *
  * @param string the description of the last action
  * @param string the id of the item related to this update
  * @param boolean TRUE to not change the edit date of this anchor, default is FALSE
  *
  * @see shared/anchor.php
  */
 function touch($action, $origin = NULL, $silently = FALSE)
 {
     global $context;
     // don't go further on import
     if (preg_match('/import$/i', $action)) {
         return;
     }
     // no item bound
     if (!isset($this->item['id'])) {
         return;
     }
     // sanity check
     if (!$origin) {
         logger::remember('users/user.php: unexpected NULL origin at touch()');
         return;
     }
     // components of the query
     $query = array();
     // append a reference to a new image to the description
     if ($action == 'image:create') {
         if (!Codes::check_embedded($this->item['description'], 'image', $origin)) {
             // the overlay may prevent embedding
             if (is_object($this->overlay) && !$this->overlay->should_embed_files()) {
             } else {
                 // list has already started
                 if (preg_match('/\\[image=[^\\]]+?\\]\\s*$/', $this->item['description'])) {
                     $query[] = "description = '" . SQL::escape($this->item['description'] . ' [image=' . $origin . ']') . "'";
                 } else {
                     $query[] = "description = '" . SQL::escape($this->item['description'] . "\n\n" . '[image=' . $origin . ']') . "'";
                 }
             }
         }
         // refresh stamp only if image update occurs within 6 hours after last edition
         if (SQL::strtotime($this->item['edit_date']) + 6 * 60 * 60 < time()) {
             $silently = TRUE;
         }
         // suppress a reference to an image that has been deleted
     } elseif ($action == 'image:delete') {
         // suppress reference in main description field
         $query[] = "description = '" . SQL::escape(Codes::delete_embedded($this->item['description'], 'image', $origin)) . "'";
         // suppress references as icon and thumbnail as well
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 if ($this->item['avatar_url'] == $url) {
                     $query[] = "avatar_url = ''";
                 }
             }
             if ($url = Images::get_thumbnail_href($image)) {
                 if ($this->item['avatar_url'] == $url) {
                     $query[] = "avatar_url = ''";
                 }
             }
         }
         // set an existing image as the user avatar
     } elseif ($action == 'image:set_as_avatar') {
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_icon_href($image)) {
                 $query[] = "avatar_url = '" . SQL::escape($url) . "'";
             }
         }
         $silently = TRUE;
         // set an existing image as the user thumbnail
     } elseif ($action == 'image:set_as_thumbnail') {
         include_once $context['path_to_root'] . 'images/images.php';
         if ($image = Images::get($origin)) {
             if ($url = Images::get_thumbnail_href($image)) {
                 $query[] = "avatar_url = '" . SQL::escape($url) . "'";
             }
         }
         $silently = TRUE;
         // append a new image
     } elseif ($action == 'image:set_as_both') {
         if (!Codes::check_embedded($this->item['description'], 'image', $origin)) {
             $query[] = "description = '" . SQL::escape($this->item['description'] . ' [image=' . $origin . ']') . "'";
         }
         // do not remember minor changes
         $silently = TRUE;
         // add a reference to a location in the article description
     } elseif ($action == 'location:create') {
         if (!Codes::check_embedded($this->item['description'], 'location', $origin)) {
             $query[] = "description = '" . SQL::escape($this->item['description'] . ' [location=' . $origin . ']') . "'";
         }
         // suppress a reference to a location that has been deleted
     } elseif ($action == 'location:delete') {
         $query[] = "description = '" . SQL::escape(Codes::delete_embedded($this->item['description'], 'location', $origin)) . "'";
         // add a reference to a new table in the user description
     } elseif ($action == 'table:create') {
         if (!Codes::check_embedded($this->item['description'], 'table', $origin)) {
             $query[] = "description = '" . SQL::escape($this->item['description'] . ' [table=' . $origin . ']') . "'";
//.........这里部分代码省略.........

        } elseif (isset($_REQUEST['anchor'])) {
            $link = 'articles/edit.php?anchor=' . $_REQUEST['anchor'];
        } else {
            $link = 'articles/edit.php';
        }
        Safe::redirect($context['url_to_home'] . $context['url_to_root'] . 'users/login.php?url=' . urlencode($link));
    }
    // permission denied to authenticated user
    Safe::header('Status: 401 Unauthorized', TRUE, 401);
    Logger::error(i18n::s('You are not allowed to perform this operation.'));
    // an error occured
} elseif (count($context['error'])) {
    $item = $_REQUEST;
    $with_form = TRUE;
    // page has been assigned to another person during the last 5 minutes
} elseif (isset($item['assign_id']) && $item['assign_id'] && !Surfer::is($item['assign_id']) && SQL::strtotime($item['assign_date']) + 5 * 60 >= time()) {
    // permission denied to authenticated user
    Safe::header('Status: 401 Unauthorized', TRUE, 401);
    $context['text'] .= Skin::build_block(sprintf(i18n::s('This page is currently edited by %s. You have to wait for a new version to be released.'), Users::get_link($item['assign_name'], $item['assign_address'], $item['assign_id'])), 'caution');
    // process uploaded data
} elseif (isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] == 'POST') {
    // protect from hackers
    if (isset($_REQUEST['edit_name'])) {
        $_REQUEST['edit_name'] = preg_replace(FORBIDDEN_IN_NAMES, '_', $_REQUEST['edit_name']);
    }
    if (isset($_REQUEST['edit_address'])) {
        $_REQUEST['edit_address'] = encode_link($_REQUEST['edit_address']);
    }
    // track anonymous surfers
    Surfer::track($_REQUEST);
    // set options

 $text .= '	<lastBuildDate>' . gmdate('D, d M Y H:i:s') . ' GMT</lastBuildDate>' . "\n" . '	<generator>yacs</generator>' . "\n" . '	<docs>http://blogs.law.harvard.edu/tech/rss</docs>' . "\n" . '	<ttl>5</ttl>' . "\n";
 // list last events
 $events = Logger::get_tail(50, 'all');
 if (is_array($events)) {
     // the actual list of events
     foreach ($events as $event) {
         list($stamp, $surfer, $script, $label, $description) = $event;
         // formatting patterns
         $search = array("|\r\n|", "|<br\\s*/>\n+|i", "|\n\n+[ \t]*-\\s+|i", "|\n[ \t]*-\\s+|i", "|\n\n+[ \t]*\\.\\s+|i", "|\n[ \t]*\\.\\s+|i", "|\n\n+[ \t]*\\*\\s+|i", "|\n[ \t]*\\*\\s+|i", "|\n\n+[ \t]*¤\\s+|i", "|\n[ \t]*¤\\s+|i", "|\n\n+[ \t]*\\•\\s+|i", "|\n[ \t]*\\•\\s+|i", "/\n[ \t]*(From|To|cc|bcc|Subject|Date):(\\s*)/i", "|\n[ \t]*>(\\s*)|i", "|\n[ \t]*\\|(\\s*)|i", "#([\n\t ])([a-z]+?)://([^, <>{}\n\r]+)#is", "#^([a-z]+?)://([^, <>{}\n\r]+)#is", "#([\n\t ])www\\.([a-z0-9\\-]+)\\.([a-z0-9\\-.\\~]+)((?:/[^,< \n\r]*)?)#is", "#([\n\t ])([a-z0-9\\-_.]+?)@([^,< \\.\n\r]+\\.[^,< \n\r]+)#is", "|\n\n|i");
         $replace = array("\n", BR, BR . BR . "- ", BR . "- ", BR . BR . "- ", BR . "- ", BR . BR . "- ", BR . "- ", BR . BR . "- ", BR . "- ", BR . BR . "• ", BR . "• ", BR . "\$1:\$2", BR . ">\$1", BR . "|\$1", "\$1<a href=\"\$2://\$3\">\$2://\$3</a>", "<a href=\"\$1://\$2\">\$1://\$2</a>", "\$1<a href=\"http://www.\$2.\$3\$4\">http://www.\$2.\$3\$4</a>", "\$1<a href=\"mailto:\$2@\$3\">\$2@\$3</a>", BR . BR);
         // build an extensive description field
         $description = nl2br(preg_replace($search, $replace, $description)) . '<p>' . $script . (strlen($surfer) > 1 ? ' for ' . $surfer : '') . ' on ' . $stamp . "</p>";
         // build a unique id
         $id = md5($label . $description . $stamp . $script . $surfer);
         // output one story
         $text .= "\n" . ' <item>' . "\n" . '		<title>' . encode_field(strip_tags($label)) . "</title>\n" . '		<description><![CDATA[ ' . $description . " ]]></description>\n" . '		<pubDate>' . gmdate('D, d M Y H:i:s', SQL::strtotime($stamp)) . " GMT</pubDate>\n" . '		<link>' . $context['url_to_home'] . $context['url_to_root'] . 'agents/?subject=events&amp;id=' . $id . "</link>\n" . '		<guid isPermaLink="false">' . $id . "</guid>\n" . '		<category>' . encode_field($script) . "</category>\n" . "\t</item>\n";
     }
 }
 // the postamble
 $text .= "\n\t</channel>\n" . '</rss>';
 //
 // transfer to the user agent
 //
 // handle the output correctly
 render_raw('text/xml; charset=' . $context['charset']);
 // suggest a name on download
 if (!headers_sent()) {
     $file_name = $context['site_name'] . '.events.rss.xml';
     $file_name =& utf8::to_ascii($file_name);
     Safe::header('Content-Disposition: inline; filename="' . str_replace('"', '', $file_name) . '"');
 }

 /**
  * get date of last modification
  *
  * @see services/check.php
  *
  * @return array the attribute 'timestamp' contains time of last update
  */
 function &check()
 {
     $response = array();
     // 'timestamp'
     if (!isset($this->item['edit_date'])) {
         $response['timestamp'] = '';
     } else {
         $response['timestamp'] = SQL::strtotime($this->item['edit_date']);
     }
     // 'name'
     if (!isset($this->item['edit_name'])) {
         $response['name'] = '';
     } else {
         $response['name'] = strip_tags($this->item['edit_name']);
     }
     return $response;
 }