/**
 * Pings back the links found in a post.
 *
 * @since 0.71
 *
 * @global string $wp_version
 *
 * @param string $content Post content to check for links.
 * @param int $post_ID Post ID.
 */
function pingback($content, $post_ID)
{
    global $wp_version;
    include_once ABSPATH . WPINC . '/class-IXR.php';
    include_once ABSPATH . WPINC . '/class-wp-http-ixr-client.php';
    // original code by Mort (http://mort.mine.nu:8080)
    $post_links = array();
    $pung = get_pung($post_ID);
    // Step 1
    // Parsing the post, external links (if any) are stored in the $post_links array
    $post_links_temp = wp_extract_urls($content);
    // Step 2.
    // Walking thru the links array
    // first we get rid of links pointing to sites, not to specific files
    // Example:
    // http://dummy-weblog.org
    // http://dummy-weblog.org/
    // http://dummy-weblog.org/post.php
    // We don't wanna ping first and second types, even if they have a valid <link/>
    foreach ((array) $post_links_temp as $link_test) {
        if (!in_array($link_test, $pung) && url_to_postid($link_test) != $post_ID && !is_local_attachment($link_test)) {
            // Also, let's never ping local attachments.
            if ($test = @parse_url($link_test)) {
                if (isset($test['query'])) {
                    $post_links[] = $link_test;
                } elseif (isset($test['path']) && $test['path'] != '/' && $test['path'] != '') {
                    $post_links[] = $link_test;
                }
            }
        }
    }
    $post_links = array_unique($post_links);
    /**
     * Fires just before pinging back links found in a post.
     *
     * @since 2.0.0
     *
     * @param array &$post_links An array of post links to be checked, passed by reference.
     * @param array &$pung       Whether a link has already been pinged, passed by reference.
     * @param int   $post_ID     The post ID.
     */
    do_action_ref_array('pre_ping', array(&$post_links, &$pung, $post_ID));
    foreach ((array) $post_links as $pagelinkedto) {
        $pingback_server_url = discover_pingback_server_uri($pagelinkedto);
        if ($pingback_server_url) {
            @set_time_limit(60);
            // Now, the RPC call
            $pagelinkedfrom = get_permalink($post_ID);
            // using a timeout of 3 seconds should be enough to cover slow servers
            $client = new WP_HTTP_IXR_Client($pingback_server_url);
            $client->timeout = 3;
            /**
             * Filter the user agent sent when pinging-back a URL.
             *
             * @since 2.9.0
             *
             * @param string $concat_useragent    The user agent concatenated with ' -- WordPress/'
             *                                    and the WordPress version.
             * @param string $useragent           The useragent.
             * @param string $pingback_server_url The server URL being linked to.
             * @param string $pagelinkedto        URL of page linked to.
             * @param string $pagelinkedfrom      URL of page linked from.
             */
            $client->useragent = apply_filters('pingback_useragent', $client->useragent . ' -- WordPress/' . $wp_version, $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom);
            // when set to true, this outputs debug messages by itself
            $client->debug = false;
            if ($client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || isset($client->error->code) && 48 == $client->error->code) {
                // Already registered
                add_ping($post_ID, $pagelinkedto);
            }
        }
    }
}

function pingback($content, $post_ID)
{
    global $wp_version, $wpdb;
    include_once ABSPATH . WPINC . '/class-IXR.php';
    // original code by Mort (http://mort.mine.nu:8080)
    $log = debug_fopen(ABSPATH . '/pingback.log', 'a');
    $post_links = array();
    debug_fwrite($log, 'BEGIN ' . date('YmdHis', time()) . "\n");
    $pung = get_pung($post_ID);
    // Variables
    $ltrs = '\\w';
    $gunk = '/#~:.?+=&%@!\\-';
    $punc = '.:?\\-';
    $any = $ltrs . $gunk . $punc;
    // Step 1
    // Parsing the post, external links (if any) are stored in the $post_links array
    // This regexp comes straight from phpfreaks.com
    // http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
    preg_match_all("{\\b http : [{$any}] +? (?= [{$punc}] * [^{$any}] | \$)}x", $content, $post_links_temp);
    // Debug
    debug_fwrite($log, 'Post contents:');
    debug_fwrite($log, $content . "\n");
    // Step 2.
    // Walking thru the links array
    // first we get rid of links pointing to sites, not to specific files
    // Example:
    // http://dummy-weblog.org
    // http://dummy-weblog.org/
    // http://dummy-weblog.org/post.php
    // We don't wanna ping first and second types, even if they have a valid <link/>
    foreach ($post_links_temp[0] as $link_test) {
        if (!in_array($link_test, $pung) && url_to_postid($link_test) != $post_ID && !is_local_attachment($link_test)) {
            // Also, let's never ping local attachments.
            $test = parse_url($link_test);
            if (isset($test['query'])) {
                $post_links[] = $link_test;
            } elseif ($test['path'] != '/' && $test['path'] != '') {
                $post_links[] = $link_test;
            }
            do_action('pre_ping', array(&$post_links, &$pung));
        }
    }
    foreach ($post_links as $pagelinkedto) {
        debug_fwrite($log, "Processing -- {$pagelinkedto}\n");
        $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048);
        if ($pingback_server_url) {
            @set_time_limit(60);
            // Now, the RPC call
            debug_fwrite($log, "Page Linked To: {$pagelinkedto} \n");
            debug_fwrite($log, 'Page Linked From: ');
            $pagelinkedfrom = get_permalink($post_ID);
            debug_fwrite($log, $pagelinkedfrom . "\n");
            // using a timeout of 3 seconds should be enough to cover slow servers
            $client = new IXR_Client($pingback_server_url);
            $client->timeout = 3;
            $client->useragent .= ' -- WordPress/' . $wp_version;
            // when set to true, this outputs debug messages by itself
            $client->debug = false;
            if ($client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto)) {
                add_ping($post_ID, $pagelinkedto);
            } else {
                debug_fwrite($log, "Error.\n Fault code: " . $client->getErrorCode() . " : " . $client->getErrorMessage() . "\n");
            }
        }
    }
    debug_fwrite($log, "\nEND: " . time() . "\n****************************\n");
    debug_fclose($log);
}

 /**
  * Process links in content
  * @global obj $wpdb DB instance
  * @global obj $post Current post
  * @param string $content Text containing links
  * @param string (optional) $group Group to add links to (Default: none)
  * @return string Content with processed links 
  */
 function process_links($content, $group = null)
 {
     //Validate
     if (!is_string($content) || empty($content) || !!$this->widget_processing && !$this->options->get_bool('enabled_widget')) {
         return $content;
     }
     //Extract links
     $links = $this->get_links($content, true);
     //Do not process content without links
     if (empty($links)) {
         return $content;
     }
     //Process links
     $protocol = array('http://', 'https://');
     $uri_home = strtolower(home_url());
     $domain = str_replace($protocol, '', $uri_home);
     $qv_att = 'attachment_id';
     //Setup group properties
     $g_props = (object) array('enabled' => $this->options->get_bool('group_links'), 'attr' => 'group', 'base' => '', 'legacy_prefix' => 'lightbox[', 'legacy_suffix' => ']');
     if ($g_props->enabled) {
         $g_props->base = is_scalar($group) ? trim(strval($group)) : '';
     }
     //Initialize content handlers
     if (!$this->handlers instanceof SLB_Content_Handlers) {
         $this->handlers = new SLB_Content_Handlers($this);
     }
     //Iterate through and activate supported links
     $uri_proto = array('raw' => '', 'source' => '');
     foreach ($links as $link) {
         //Init vars
         $pid = 0;
         $link_new = $link;
         $internal = false;
         $q = null;
         $uri = (object) $uri_proto;
         $type = false;
         $props_extra = array();
         //Parse link attributes
         $attrs = $this->util->parse_attribute_string($link_new, array('href' => ''));
         //Get URI
         $uri->raw = $uri->source = $attrs['href'];
         //Stop processing invalid links
         if (!$this->validate_uri($uri->raw) || $this->has_attribute($attrs, 'active', false)) {
             continue;
         }
         //Check if item links to internal media (attachment)
         if (0 === strpos($uri->raw, '/')) {
             //Relative URIs are always internal
             $internal = true;
             $uri->source = $uri_home . $uri->raw;
         } else {
             //Absolute URI
             $uri_dom = str_replace($protocol, '', strtolower($uri->raw));
             if (strpos($uri_dom, $domain) === 0) {
                 $internal = true;
             }
             unset($uri_dom);
         }
         //Get source URI (e.g. attachments)
         if ($internal && is_local_attachment($uri->source)) {
             $pid = url_to_postid($uri->source);
             $src = wp_get_attachment_url($pid);
             if (!!$src) {
                 $uri->source = $src;
                 $props_extra['id'] = $pid;
             }
             unset($src);
         }
         /* Determine content type */
         //Check if URI has already been processed
         if ($this->media_item_cached($uri->source)) {
             $i = $this->get_cached_media_item($uri->source);
             $type = $i->type;
         } else {
             //Get handler match
             $hdl_result = $this->handlers->match($uri->source);
             if (!!$hdl_result->handler) {
                 $type = $hdl_result->handler->get_id();
                 $props_extra = $hdl_result->props;
                 //Updated source URI
                 if (isset($props_extra['uri'])) {
                     $uri->source = $props_extra['uri'];
                     unset($props_extra['uri']);
                 }
             }
         }
         //Stop processing if link type not valid
         if (!$type) {
             //Cache
             $this->validated_uris[$uri->raw] = false;
             continue;
         }
//.........这里部分代码省略.........

/**
 * Pings back the links found in a post.
 *
 * @since 0.71
 * @uses $wp_version
 * @uses IXR_Client
 *
 * @param string $content Post content to check for links.
 * @param int $post_ID Post ID.
 */
function pingback($content, $post_ID)
{
    global $wp_version;
    include_once ABSPATH . WPINC . '/class-IXR.php';
    // original code by Mort (http://mort.mine.nu:8080)
    $post_links = array();
    $pung = get_pung($post_ID);
    // Variables
    $ltrs = '\\w';
    $gunk = '/#~:.?+=&%@!\\-';
    $punc = '.:?\\-';
    $any = $ltrs . $gunk . $punc;
    // Step 1
    // Parsing the post, external links (if any) are stored in the $post_links array
    // This regexp comes straight from phpfreaks.com
    // http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
    preg_match_all("{\\b http : [{$any}] +? (?= [{$punc}] * [^{$any}] | \$)}x", $content, $post_links_temp);
    // Step 2.
    // Walking thru the links array
    // first we get rid of links pointing to sites, not to specific files
    // Example:
    // http://dummy-weblog.org
    // http://dummy-weblog.org/
    // http://dummy-weblog.org/post.php
    // We don't wanna ping first and second types, even if they have a valid <link/>
    foreach ((array) $post_links_temp[0] as $link_test) {
        if (!in_array($link_test, $pung) && url_to_postid($link_test) != $post_ID && !is_local_attachment($link_test)) {
            // Also, let's never ping local attachments.
            if ($test = @parse_url($link_test)) {
                if (isset($test['query'])) {
                    $post_links[] = $link_test;
                } elseif ($test['path'] != '/' && $test['path'] != '') {
                    $post_links[] = $link_test;
                }
            }
        }
    }
    do_action_ref_array('pre_ping', array(&$post_links, &$pung));
    foreach ((array) $post_links as $pagelinkedto) {
        $pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048);
        if ($pingback_server_url) {
            @set_time_limit(60);
            // Now, the RPC call
            $pagelinkedfrom = get_permalink($post_ID);
            // using a timeout of 3 seconds should be enough to cover slow servers
            $client = new IXR_Client($pingback_server_url);
            $client->timeout = 3;
            $client->useragent .= ' -- WordPress/' . $wp_version;
            // when set to true, this outputs debug messages by itself
            $client->debug = false;
            if ($client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || isset($client->error->code) && 48 == $client->error->code) {
                // Already registered
                add_ping($post_ID, $pagelinkedto);
            }
        }
    }
}

 /**
  * Process links in content
  * @global obj $wpdb DB instance
  * @global obj $post Current post
  * @param string $content Text containing links
  * @param string (optional) $group Group to add links to (Default: none)
  * @return string Content with processed links 
  */
 protected function process_links($content, $group = null)
 {
     // Extract links
     $links = $this->get_links($content, true);
     // Do not process content without links
     if (empty($links)) {
         return $content;
     }
     // Process links
     static $protocol = array('http://', 'https://');
     static $qv_att = 'attachment_id';
     static $uri_origin = null;
     if (!is_array($uri_origin)) {
         $uri_parts = array_fill_keys(array('scheme', 'host', 'path'), '');
         $uri_origin = wp_parse_args(parse_url(strtolower(home_url())), $uri_parts);
     }
     static $uri_proto = null;
     if (empty($uri_proto)) {
         $uri_proto = (object) array('raw' => '', 'source' => '', 'parts' => '');
     }
     $uri_parts_required = array('host' => '');
     // Setup group properties
     $g_props = (object) array('enabled' => $this->options->get_bool('group_links'), 'attr' => 'group', 'base' => '', 'legacy_prefix' => 'lightbox[', 'legacy_suffix' => ']');
     if ($g_props->enabled) {
         $g_props->base = is_scalar($group) ? trim(strval($group)) : '';
     }
     // Initialize content handlers
     if (!$this->handlers instanceof SLB_Content_Handlers) {
         $this->handlers = new SLB_Content_Handlers($this);
     }
     // Iterate through and activate supported links
     foreach ($links as $link) {
         // Init vars
         $pid = 0;
         $link_new = $link;
         $uri = clone $uri_proto;
         $type = false;
         $props_extra = array();
         $key = null;
         $internal = false;
         // Parse link attributes
         $attrs = $this->util->parse_attribute_string($link_new, array('href' => ''));
         // Get URI
         $uri->raw = $attrs['href'];
         // Stop processing invalid links
         if (!$this->validate_uri($uri->raw) || $this->has_attribute($attrs, 'active', false)) {
             continue;
         }
         // Normalize URI (make absolute)
         $uri->source = WP_HTTP::make_absolute_url($uri->raw, $uri_origin['scheme'] . '://' . $uri_origin['host']);
         // URI cached?
         $key = $this->get_media_item_id($uri->source);
         // Internal URI? (e.g. attachments)
         if (!$key) {
             $uri->parts = array_merge($uri_parts_required, (array) parse_url($uri->source));
             $internal = $uri->parts['host'] === $uri_origin['host'] ? true : false;
             // Attachment?
             if ($internal && is_local_attachment($uri->source)) {
                 $pid = url_to_postid($uri->source);
                 $src = wp_get_attachment_url($pid);
                 if (!!$src) {
                     $uri->source = $src;
                     $props_extra['id'] = $pid;
                     // Check cache for attachment source URI
                     $key = $this->get_media_item_id($uri->source);
                 }
                 unset($src);
             }
         }
         // Determine content type
         if (!$key) {
             // Get handler match
             $hdl_result = $this->handlers->match($uri->source);
             if (!!$hdl_result->handler) {
                 $type = $hdl_result->handler->get_id();
                 $props_extra = $hdl_result->props;
                 // Updated source URI
                 if (isset($props_extra['uri'])) {
                     $uri->source = $props_extra['uri'];
                     unset($props_extra['uri']);
                 }
             }
             // Cache valid item
             if (!!$type) {
                 $key = $this->cache_media_item($uri, $type, $internal, $props_extra);
             }
         }
         // Stop processing invalid links
         if (!$key) {
             // Cache invalid URI
             $this->validated_uris[$uri->source] = false;
             if ($uri->raw !== $uri->source) {
//.........这里部分代码省略.........