WordPress/wp-includes/update.php

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<?php
// A simple set of functions to check our version 1.0 update service
function wp_version_check() {
global $wp_version;
$php_version = phpversion();
$current = get_option( 'update_core' );
$locale = get_locale();
if (
isset( $current->last_checked ) &&
43200 > ( time() - $current->last_checked ) &&
$current->version_checked == $wp_version
)
return false;
$new_option = '';
$new_option->last_checked = time(); // this gets set whether we get a response or not, so if something is down or misconfigured it won't delay the page load for more than 3 seconds, twice a day
$new_option->version_checked = $wp_version;
$http_request = "GET /core/version-check/1.0/?version=$wp_version&php=$php_version&locale=$locale HTTP/1.0\r\n";
$http_request .= "Host: api.wordpress.org\r\n";
$http_request .= 'Content-Type: application/x-www-form-urlencoded; charset=' . get_option('blog_charset') . "\r\n";
$http_request .= 'User-Agent: WordPress/' . $wp_version . '; ' . get_bloginfo('url') . "\r\n";
$http_request .= "\r\n";
$response = '';
if ( false !== ( $fs = @fsockopen( 'api.wordpress.org', 80, $errno, $errstr, 3 ) ) ) {
fwrite( $fs, $http_request );
while ( !feof( $fs ) )
$response .= fgets( $fs, 1160 ); // One TCP-IP packet
fclose( $fs );
$response = explode("\r\n\r\n", $response, 2);
$body = trim( $response[1] );
$body = str_replace(array("\r\n", "\r"), "\n", $body);
$returns = explode("\n", $body);
$new_option->response = $returns[0];
if ( isset( $returns[1] ) )
$new_option->url = $returns[1];
}
update_option( 'update_core', $new_option );
}
wp_version_check();
?>