WordPress/links.weblogs.com.php

148 lines
4.5 KiB
PHP

<?
include_once('links.config.php');
require_once('./b2config.php');
require_once($b2inc.'/b2functions.php');
// globals to hold state
$updated_timestamp = 0;
$all_links = array();
/**
** preload_links()
** Pre-load the visible, non-blank, links into an associative array $all_links
** key is url, value is array of link_id and update_time
** Note: update time is initialised to 0. That way we only have to update (in
** the db) the ones which have been updated.
**/
function preload_links() {
global $tablelinks, $all_links;
dbconnect();
$sql = "SELECT link_id, link_url FROM $tablelinks WHERE link_visible = 'Y' AND link_url <> ''";
$result = mysql_query($sql)
or die("Couldn't execute query. " . $sql . mysql_error());
while ($row = mysql_fetch_object($result)) {
$all_links[$row->link_url] = array($row->link_id,0);
}
}
/**
** update_links()
** Update in the db the links which have been updated ($all_links[url][1] != 0)
**/
function update_links() {
global $tablelinks, $all_links;
dbconnect();
reset($all_links);
while (list($id, $val) = each($all_links)) {
if ($val[1]) {
$sql = "UPDATE $tablelinks SET link_updated = '$val[1]' WHERE link_id = $val[0] ";
//echo("executing: $sql\n");
if (mysql_query($sql) == false) {
//ignore update errors! no data loss
//echo("Couldn't execute query. " . $sql . mysql_error());
}
}
} // end while
}
/**
** get_weblogs_updatedfile()
** Retrieves and caches a copy of the weblogs.com changed blogs xml file.
** If the file exists check it's age, get new copy if old.
** If a new or updated file has been written return true (needs processing)
** otherwise return false (nothing to do)
**/
function get_weblogs_updatedfile() {
global $weblogs_cache_file, $weblogs_xml_url, $weblogs_cacheminutes;
$update = false;
if (file_exists($weblogs_cache_file)) {
// is it old?
$modtime = filemtime($weblogs_cache_file);
if ((time() - $modtime) > ($weblogs_cacheminutes * 60)) {
$update = true;
}
} else { // doesn't exist
$update = true;
}
if ($update) {
// get a new copy
$contents = implode('', file($weblogs_xml_url)); // file_get_contents not available < 4.3
$cachefp = fopen($weblogs_cache_file, "w");
fwrite($cachefp, $contents);
fclose($cachefp);
}
return $update;
}
/**
** startElement()
** Callback function. Called at the start of a new xml tag.
**/
function startElement($parser, $tagName, $attrs) {
global $updated_timestamp, $all_links;
if ($tagName == 'WEBLOGUPDATES') {
//convert 'updated' into php date variable
$updated_timestamp = strtotime($attrs['UPDATED']);
//echo('got timestamp of ' . gmdate('F j, Y, H:i:s', $updated_timestamp) . "\n");
} else if ($tagName == 'WEBLOG') {
// is this url in our links?
if (isset($all_links[$attrs['URL']])) {
$all_links[$attrs['URL']][1] = gmdate('YmdHis', $updated_timestamp - $attrs['WHEN']);
//echo('set link id ' . $all_links[$attrs['URL']][0] . ' to date ' . $all_links[$attrs['URL']][1] . "\n");
}
}
}
/**
** endElement()
** Callback function. Called at the end of an xml tag.
**/
function endElement($parser, $tagName) {
// nothing to do.
}
// get/update the cache file.
// true return means new copy
if (get_weblogs_updatedfile()) {
// pre-load the links
preload_links();
// Create an XML parser
$xml_parser = xml_parser_create();
// Set the functions to handle opening and closing tags
xml_set_element_handler($xml_parser, "startElement", "endElement");
// Open the XML file for reading
$fp = fopen($weblogs_cache_file, "r")
or die("Error reading XML data.");
//echo('<pre>');
// Read the XML file 4KB at a time
while ($data = fread($fp, 4096)) {
// Parse each 4KB chunk with the XML parser created above
xml_parse($xml_parser, $data, feof($fp))
// Handle errors in parsing
or die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
}
// Close the XML file
fclose($fp);
// Free up memory used by the XML parser
xml_parser_free($xml_parser);
// now update the db with latest times
update_links();
//echo('</pre>');
} // end if updated cache file
?>