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Google Sitemaps
Hello CI coders, this is my first contribution to CI so please bare with me on this one. Ok, this is a plugin to help on your website SEO, it helps your create an autocompressed (.gz) sitemap for google or others search engines. This plugin is based in a class from [b]Svetoslav Marinov[/b]
Requirements:
- Google webmaster tools account
First save the following code as "google_sitemap_pi.php" in your plugin folder
[code] <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); /** A class for generating simple google sitemaps *@author Svetoslav Marinov [email protected] *@copyright 2005 *@version 0.1 *@access public *@package google_sitemap *@link http://devquickref.com */ class google_sitemap { var $header = "<\x3Fxml version="1.0" encoding="UTF-8"\x3F>\n\t<urlset xmlns="http://www.google.com/schemas/sitemap/0.84\">"; var $charset = "UTF-8"; var $footer = "\t\n"; var $items = array();
/** Adds a new item to the channel contents. *@param google_sitemap item $new_item *@access public */ function add_item($new_item){ //Make sure $new_item is an 'google_sitemap item' object if(!is_a($new_item, "google_sitemap_item")){ //Stop execution with an error message trigger_error("Can't add a non-google_sitemap_item object to the sitemap items array"); } $this->items[] = $new_item; }
/** Generates the sitemap XML data based on object properties. *@param string $file_name ( optional ) if file name is supplied the XML data is saved in it otherwise returned as a string. *@access public *@return [void|string] */ function build( $file_name = null ) { $map = $this->header . "\n";
foreach($this->items as $item)
{
$item->loc = htmlentities($item->loc, ENT_QUOTES);
$map .= "\t\t<url>\n\t\t\t<loc>$item->loc</loc>\n";
// lastmod
if ( !empty( $item->lastmod ) )
$map .= "\t\t\t<lastmod>$item->lastmod</lastmod>\n";
// changefreq
if ( !empty( $item->changefreq ) )
$map .= "\t\t\t<changefreq>$item->changefreq</changefreq>\n";
// priority
if ( !empty( $item->priority ) )
$map .= "\t\t\t<priority>$item->priority</priority>\n";
$map .= "\t\t</url>\n\n";
}
$map .= $this->footer . "\n";
if(!is_null($file_name)){
$fh = fopen($file_name, 'w');
fwrite($fh, $map);
fclose($fh);
}else{
return $map;
}
}
}
/** A class for storing google_sitemap items and will be added to google_sitemap objects. *@author Svetoslav Marinov [email protected] *@copyright 2005 *@access public *@package google_sitemap_item *@link http://devquickref.com @version 0.1 / class google_sitemap_item { / Assigns constructor parameters to their corresponding object properties. *@access public *@param string $loc location *@param string $lastmod date (optional) format in YYYY-MM-DD or in "ISO 8601" format *@param string $changefreq (optional)( always,hourly,daily,weekly,monthly,yearly,never ) *@param string $priority (optional) current link's priority ( 0.0-1.0 ) */ function google_sitemap_item( $loc, $lastmod = '', $changefreq = '', $priority = '' ) { $this->loc = $loc; $this->lastmod = $lastmod; $this->changefreq = $changefreq; $this->priority = $priority; } } ?> [/code]
Ok, so now we will create a controller to make the sitemap.xml.gz and ping google to let him know that there's a new sitemap on our website for him to fetch and update googlebot. Of course you can autoload the plugin, but in our example let's justkeep it simple.
[code] <?php class My_controller extends Controller { function My_controller() { parent::Controller(); $this->load->helper(array('text','url')); $this->load->plugin('google_sitemap'); //Load Plugin }
function index()
{
$sitemap = new google_sitemap; //Create a new Sitemap Object
$item = new google_sitemap_item(base_url()."MY_WEBSITE_URL",date("Y-m-d"), 'weekly', '0.8' ); //Create a new Item
$sitemap->add_item($item); //Append the item to the sitemap object
$sitemap->build("./sitemap.xml"); //Build it...
//Let's compress it to gz
$data = implode("", file("./sitemap.xml"));
$gzdata = gzencode($data, 9);
$fp = fopen("./sitemap.xml.gz", "w");
fwrite($fp, $gzdata);
fclose($fp);
//Let's Ping google
$this->_pingGoogleSitemaps(base_url()."/sitemap.xml.gz");
}
function _pingGoogleSitemaps( $url_xml )
{
$status = 0;
$google = 'www.google.com';
if( $fp=@fsockopen($google, 80) )
{
$req = 'GET /webmasters/sitemaps/ping?sitemap=' .
urlencode( $url_xml ) . " HTTP/1.1\r\n" .
"Host: $google\r\n" .
"User-Agent: Mozilla/5.0 (compatible; " .
PHP_OS . ") PHP/" . PHP_VERSION . "\r\n" .
"Connection: Close\r\n\r\n";
fwrite( $fp, $req );
while( !feof($fp) )
{
if( @preg_match('~^HTTP/\d\.\d (\d+)~i', fgets($fp, 128), $m) )
{
$status = intval( $m[1] );
break;
}
}
fclose( $fp );
}
return( $status );
}
} [/code]
As you can see, this is very simple to implement, you can fetch data from your database and create your urls on the fly, you can even create a cron job on your server to auto create the sitemap and ping google like: wget http://your-host.com/my_controller/ , then your controller will generate a new sitemap.xml.gz and submit it to www.google.com//webmasters/sitemaps/ping?sitemap=http://your-host.com/sitemap.xml.gz
I use this on my website and it's perfectly running, I hope this would help you in anyway.
Cheers, Henrique Barroso
Download it here if you are lazy: File:google_sitemap_pi.zip