<?php /** * @file include/network.php */ require_once("include/xml.php"); require_once('include/Probe.php'); /** * @brief Curl wrapper * * If binary flag is true, return binary results. * Set the cookiejar argument to a string (e.g. "/tmp/friendica-cookies.txt") * to preserve cookies from one request to the next. * * @param string $url URL to fetch * @param boolean $binary default false * TRUE if asked to return binary results (file download) * @param integer $redirects The recursion counter for internal use - default 0 * @param integer $timeout Timeout in seconds, default system config value or 60 seconds * @param string $accept_content supply Accept: header with 'accept_content' as the value * @param string $cookiejar Path to cookie jar file * * @return string The fetched content */ function fetch_url($url,$binary = false, &$redirects = 0, $timeout = 0, $accept_content=Null, $cookiejar = 0) { $ret = z_fetch_url( $url, $binary, $redirects, array('timeout'=>$timeout, 'accept_content'=>$accept_content, 'cookiejar'=>$cookiejar )); return($ret['body']); } /** * @brief fetches an URL. * * @param string $url URL to fetch * @param boolean $binary default false * TRUE if asked to return binary results (file download) * @param int $redirects The recursion counter for internal use - default 0 * @param array $opts (optional parameters) assoziative array with: * 'accept_content' => supply Accept: header with 'accept_content' as the value * 'timeout' => int Timeout in seconds, default system config value or 60 seconds * 'http_auth' => username:password * 'novalidate' => do not validate SSL certs, default is to validate using our CA list * 'nobody' => only return the header * 'cookiejar' => path to cookie jar file * * @return array an assoziative array with: * int 'return_code' => HTTP return code or 0 if timeout or failure * boolean 'success' => boolean true (if HTTP 2xx result) or false * string 'redirect_url' => in case of redirect, content was finally retrieved from this URL * string 'header' => HTTP headers * string 'body' => fetched content */ function z_fetch_url($url,$binary = false, &$redirects = 0, $opts=array()) { $ret = array('return_code' => 0, 'success' => false, 'header' => "", 'body' => ""); $stamp1 = microtime(true); $a = get_app(); $ch = @curl_init($url); if(($redirects > 8) || (! $ch)) return false; @curl_setopt($ch, CURLOPT_HEADER, true); if(x($opts,"cookiejar")) { curl_setopt($ch, CURLOPT_COOKIEJAR, $opts["cookiejar"]); curl_setopt($ch, CURLOPT_COOKIEFILE, $opts["cookiejar"]); } // These settings aren't needed. We're following the location already. // @curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // @curl_setopt($ch, CURLOPT_MAXREDIRS, 5); if (x($opts,'accept_content')){ curl_setopt($ch,CURLOPT_HTTPHEADER, array ( "Accept: " . $opts['accept_content'] )); } @curl_setopt($ch, CURLOPT_RETURNTRANSFER,true); @curl_setopt($ch, CURLOPT_USERAGENT, $a->get_useragent()); if(x($opts,'headers')){ @curl_setopt($ch, CURLOPT_HTTPHEADER, $opts['headers']); } if(x($opts,'nobody')){ @curl_setopt($ch, CURLOPT_NOBODY, $opts['nobody']); } if(x($opts,'timeout')){ @curl_setopt($ch, CURLOPT_TIMEOUT, $opts['timeout']); } else { $curl_time = intval(get_config('system','curl_timeout')); @curl_setopt($ch, CURLOPT_TIMEOUT, (($curl_time !== false) ? $curl_time : 60)); } // by default we will allow self-signed certs // but you can override this $check_cert = get_config('system','verifyssl'); @curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false)); @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, (($check_cert) ? 2 : false)); $prx = get_config('system','proxy'); if(strlen($prx)) { @curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1); @curl_setopt($ch, CURLOPT_PROXY, $prx); $prxusr = @get_config('system','proxyuser'); if(strlen($prxusr)) @curl_setopt($ch, CURLOPT_PROXYUSERPWD, $prxusr); } if($binary) @curl_setopt($ch, CURLOPT_BINARYTRANSFER,1); $a->set_curl_code(0); // don't let curl abort the entire application // if it throws any errors. $s = @curl_exec($ch); if (curl_errno($ch) !== CURLE_OK) { logger('fetch_url error fetching '.$url.': '.curl_error($ch), LOGGER_NORMAL); } $base = $s; $curl_info = @curl_getinfo($ch); $http_code = $curl_info['http_code']; logger('fetch_url '.$url.': '.$http_code." ".$s, LOGGER_DATA); $header = ''; // Pull out multiple headers, e.g. proxy and continuation headers // allow for HTTP/2.x without fixing code while(preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/',$base)) { $chunk = substr($base,0,strpos($base,"\r\n\r\n")+4); $header .= $chunk; $base = substr($base,strlen($chunk)); } $a->set_curl_code($http_code); $a->set_curl_content_type($curl_info['content_type']); $a->set_curl_headers($header); if($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307) { $new_location_info = @parse_url($curl_info["redirect_url"]); $old_location_info = @parse_url($curl_info["url"]); $newurl = $curl_info["redirect_url"]; if (($new_location_info["path"] == "") AND ($new_location_info["host"] != "")) $newurl = $new_location_info["scheme"]."://".$new_location_info["host"].$old_location_info["path"]; $matches = array(); if (preg_match('/(Location:|URI:)(.*?)\n/i', $header, $matches)) { $newurl = trim(array_pop($matches)); } if(strpos($newurl,'/') === 0) $newurl = $old_location_info["scheme"]."://".$old_location_info["host"].$newurl; if (filter_var($newurl, FILTER_VALIDATE_URL)) { $redirects++; @curl_close($ch); return z_fetch_url($newurl,$binary, $redirects, $opts); } } $a->set_curl_code($http_code); $a->set_curl_content_type($curl_info['content_type']); $body = substr($s,strlen($header)); $rc = intval($http_code); $ret['return_code'] = $rc; $ret['success'] = (($rc >= 200 && $rc <= 299) ? true : false); $ret['redirect_url'] = $url; if(! $ret['success']) { $ret['error'] = curl_error($ch); $ret['debug'] = $curl_info; logger('z_fetch_url: error: ' . $url . ': ' . $ret['error'], LOGGER_DEBUG); logger('z_fetch_url: debug: ' . print_r($curl_info,true), LOGGER_DATA); } $ret['body'] = substr($s,strlen($header)); $ret['header'] = $header; if(x($opts,'debug')) { $ret['debug'] = $curl_info; } @curl_close($ch); $a->save_timestamp($stamp1, "network"); return($ret); } // post request to $url. $params is an array of post variables. /** * @brief Post request to $url * * @param string $url URL to post * @param mixed $params * @param string $headers HTTP headers * @param integer $redirects Recursion counter for internal use - default = 0 * @param integer $timeout The timeout in seconds, default system config value or 60 seconds * * @return string The content */ function post_url($url,$params, $headers = null, &$redirects = 0, $timeout = 0) { $stamp1 = microtime(true); $a = get_app(); $ch = curl_init($url); if(($redirects > 8) || (! $ch)) return false; logger("post_url: start ".$url, LOGGER_DATA); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt($ch, CURLOPT_RETURNTRANSFER,true); curl_setopt($ch, CURLOPT_POST,1); curl_setopt($ch, CURLOPT_POSTFIELDS,$params); curl_setopt($ch, CURLOPT_USERAGENT, $a->get_useragent()); if(intval($timeout)) { curl_setopt($ch, CURLOPT_TIMEOUT, $timeout); } else { $curl_time = intval(get_config('system','curl_timeout')); curl_setopt($ch, CURLOPT_TIMEOUT, (($curl_time !== false) ? $curl_time : 60)); } if(defined('LIGHTTPD')) { if(!is_array($headers)) { $headers = array('Expect:'); } else { if(!in_array('Expect:', $headers)) { array_push($headers, 'Expect:'); } } } if($headers) curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); $check_cert = get_config('system','verifyssl'); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false)); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, (($check_cert) ? 2 : false)); $prx = get_config('system','proxy'); if(strlen($prx)) { curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1); curl_setopt($ch, CURLOPT_PROXY, $prx); $prxusr = get_config('system','proxyuser'); if(strlen($prxusr)) curl_setopt($ch, CURLOPT_PROXYUSERPWD, $prxusr); } $a->set_curl_code(0); // don't let curl abort the entire application // if it throws any errors. $s = @curl_exec($ch); $base = $s; $curl_info = curl_getinfo($ch); $http_code = $curl_info['http_code']; logger("post_url: result ".$http_code." - ".$url, LOGGER_DATA); $header = ''; // Pull out multiple headers, e.g. proxy and continuation headers // allow for HTTP/2.x without fixing code while(preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/',$base)) { $chunk = substr($base,0,strpos($base,"\r\n\r\n")+4); $header .= $chunk; $base = substr($base,strlen($chunk)); } if($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307) { $matches = array(); preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches); $newurl = trim(array_pop($matches)); if(strpos($newurl,'/') === 0) $newurl = $old_location_info["scheme"] . "://" . $old_location_info["host"] . $newurl; if (filter_var($newurl, FILTER_VALIDATE_URL)) { $redirects++; logger("post_url: redirect ".$url." to ".$newurl); return post_url($newurl,$params, $headers, $redirects, $timeout); //return fetch_url($newurl,false,$redirects,$timeout); } } $a->set_curl_code($http_code); $body = substr($s,strlen($header)); $a->set_curl_headers($header); curl_close($ch); $a->save_timestamp($stamp1, "network"); logger("post_url: end ".$url, LOGGER_DATA); return($body); } // Generic XML return // Outputs a basic dfrn XML status structure to STDOUT, with a <status> variable // of $st and an optional text <message> of $message and terminates the current process. function xml_status($st, $message = '') { $xml_message = ((strlen($message)) ? "\t<message>" . xmlify($message) . "</message>\r\n" : ''); if($st) logger('xml_status returning non_zero: ' . $st . " message=" . $message); header( "Content-type: text/xml" ); echo '<?xml version="1.0" encoding="UTF-8"?>'."\r\n"; echo "<result>\r\n\t<status>$st</status>\r\n$xml_message</result>\r\n"; killme(); } /** * @brief Send HTTP status header and exit. * * @param integer $val HTTP status result value * @param array $description optional message * 'title' => header title * 'description' => optional message */ function http_status_exit($val, $description = array()) { $err = ''; if($val >= 400) { $err = 'Error'; if (!isset($description["title"])) $description["title"] = $err." ".$val; } if($val >= 200 && $val < 300) $err = 'OK'; logger('http_status_exit ' . $val); header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err); if (isset($description["title"])) { $tpl = get_markup_template('http_status.tpl'); echo replace_macros($tpl, array('$title' => $description["title"], '$description' => $description["description"])); } killme(); } /** * @brief Check URL to se if ts's real * * Take a URL from the wild, prepend http:// if necessary * and check DNS to see if it's real (or check if is a valid IP address) * * @param string $url The URL to be validated * @return boolean True if it's a valid URL, fals if something wrong with it */ function validate_url(&$url) { if(get_config('system','disable_url_validation')) return true; // no naked subdomains (allow localhost for tests) if(strpos($url,'.') === false && strpos($url,'/localhost/') === false) return false; if(substr($url,0,4) != 'http') $url = 'http://' . $url; $h = @parse_url($url); if(($h) && (dns_get_record($h['host'], DNS_A + DNS_CNAME + DNS_PTR) || filter_var($h['host'], FILTER_VALIDATE_IP) )) { return true; } return false; } /** * @brief Checks that email is an actual resolvable internet address * * @param string $addr The email address * @return boolean True if it's a valid email address, false if it's not */ function validate_email($addr) { if(get_config('system','disable_email_validation')) return true; if(! strpos($addr,'@')) return false; $h = substr($addr,strpos($addr,'@') + 1); if(($h) && (dns_get_record($h, DNS_A + DNS_CNAME + DNS_PTR + DNS_MX) || filter_var($h, FILTER_VALIDATE_IP) )) { return true; } return false; } /** * @brief Check if URL is allowed * * Check $url against our list of allowed sites, * wildcards allowed. If allowed_sites is unset return true; * * @param string $url URL which get tested * @return boolean True if url is allowed otherwise return false */ function allowed_url($url) { $h = @parse_url($url); if(! $h) { return false; } $str_allowed = get_config('system','allowed_sites'); if(! $str_allowed) return true; $found = false; $host = strtolower($h['host']); // always allow our own site if($host == strtolower($_SERVER['SERVER_NAME'])) return true; $fnmatch = function_exists('fnmatch'); $allowed = explode(',',$str_allowed); if(count($allowed)) { foreach($allowed as $a) { $pat = strtolower(trim($a)); if(($fnmatch && fnmatch($pat,$host)) || ($pat == $host)) { $found = true; break; } } } return $found; } /** * @brief Check if email address is allowed to register here. * * Compare against our list (wildcards allowed). * * @param type $email * @return boolean False if not allowed, true if allowed * or if allowed list is not configured */ function allowed_email($email) { $domain = strtolower(substr($email,strpos($email,'@') + 1)); if(! $domain) return false; $str_allowed = get_config('system','allowed_email'); if(! $str_allowed) return true; $found = false; $fnmatch = function_exists('fnmatch'); $allowed = explode(',',$str_allowed); if(count($allowed)) { foreach($allowed as $a) { $pat = strtolower(trim($a)); if(($fnmatch && fnmatch($pat,$domain)) || ($pat == $domain)) { $found = true; break; } } } return $found; } function avatar_img($email) { $a = get_app(); $avatar['size'] = 175; $avatar['email'] = $email; $avatar['url'] = ''; $avatar['success'] = false; call_hooks('avatar_lookup', $avatar); if(! $avatar['success']) $avatar['url'] = $a->get_baseurl() . '/images/person-175.jpg'; logger('Avatar: ' . $avatar['email'] . ' ' . $avatar['url'], LOGGER_DEBUG); return $avatar['url']; } function parse_xml_string($s,$strict = true) { /// @todo Move this function to the xml class if($strict) { if(! strstr($s,'<?xml')) return false; $s2 = substr($s,strpos($s,'<?xml')); } else $s2 = $s; libxml_use_internal_errors(true); $x = @simplexml_load_string($s2); if(! $x) { logger('libxml: parse: error: ' . $s2, LOGGER_DATA); foreach(libxml_get_errors() as $err) logger('libxml: parse: ' . $err->code." at ".$err->line.":".$err->column." : ".$err->message, LOGGER_DATA); libxml_clear_errors(); } return $x; } function scale_external_images($srctext, $include_link = true, $scale_replace = false) { // Suppress "view full size" if (intval(get_config('system','no_view_full_size'))) $include_link = false; $a = get_app(); // Picture addresses can contain special characters $s = htmlspecialchars_decode($srctext); $matches = null; $c = preg_match_all('/\[img.*?\](.*?)\[\/img\]/ism',$s,$matches,PREG_SET_ORDER); if($c) { require_once('include/Photo.php'); foreach($matches as $mtch) { logger('scale_external_image: ' . $mtch[1]); $hostname = str_replace('www.','',substr($a->get_baseurl(),strpos($a->get_baseurl(),'://')+3)); if(stristr($mtch[1],$hostname)) continue; // $scale_replace, if passed, is an array of two elements. The // first is the name of the full-size image. The second is the // name of a remote, scaled-down version of the full size image. // This allows Friendica to display the smaller remote image if // one exists, while still linking to the full-size image if($scale_replace) $scaled = str_replace($scale_replace[0], $scale_replace[1], $mtch[1]); else $scaled = $mtch[1]; $i = @fetch_url($scaled); if(! $i) return $srctext; // guess mimetype from headers or filename $type = guess_image_type($mtch[1],true); if($i) { $ph = new Photo($i, $type); if($ph->is_valid()) { $orig_width = $ph->getWidth(); $orig_height = $ph->getHeight(); if($orig_width > 640 || $orig_height > 640) { $ph->scaleImage(640); $new_width = $ph->getWidth(); $new_height = $ph->getHeight(); logger('scale_external_images: ' . $orig_width . '->' . $new_width . 'w ' . $orig_height . '->' . $new_height . 'h' . ' match: ' . $mtch[0], LOGGER_DEBUG); $s = str_replace($mtch[0],'[img=' . $new_width . 'x' . $new_height. ']' . $scaled . '[/img]' . "\n" . (($include_link) ? '[url=' . $mtch[1] . ']' . t('view full size') . '[/url]' . "\n" : ''),$s); logger('scale_external_images: new string: ' . $s, LOGGER_DEBUG); } } } } } // replace the special char encoding $s = htmlspecialchars($s,ENT_NOQUOTES,'UTF-8'); return $s; } function fix_contact_ssl_policy(&$contact,$new_policy) { $ssl_changed = false; if((intval($new_policy) == SSL_POLICY_SELFSIGN || $new_policy === 'self') && strstr($contact['url'],'https:')) { $ssl_changed = true; $contact['url'] = str_replace('https:','http:',$contact['url']); $contact['request'] = str_replace('https:','http:',$contact['request']); $contact['notify'] = str_replace('https:','http:',$contact['notify']); $contact['poll'] = str_replace('https:','http:',$contact['poll']); $contact['confirm'] = str_replace('https:','http:',$contact['confirm']); $contact['poco'] = str_replace('https:','http:',$contact['poco']); } if((intval($new_policy) == SSL_POLICY_FULL || $new_policy === 'full') && strstr($contact['url'],'http:')) { $ssl_changed = true; $contact['url'] = str_replace('http:','https:',$contact['url']); $contact['request'] = str_replace('http:','https:',$contact['request']); $contact['notify'] = str_replace('http:','https:',$contact['notify']); $contact['poll'] = str_replace('http:','https:',$contact['poll']); $contact['confirm'] = str_replace('http:','https:',$contact['confirm']); $contact['poco'] = str_replace('http:','https:',$contact['poco']); } if($ssl_changed) { q("update contact set url = '%s', request = '%s', notify = '%s', poll = '%s', confirm = '%s', poco = '%s' where id = %d limit 1", dbesc($contact['url']), dbesc($contact['request']), dbesc($contact['notify']), dbesc($contact['poll']), dbesc($contact['confirm']), dbesc($contact['poco']), intval($contact['id']) ); } } function original_url($url, $depth=1, $fetchbody = false) { $a = get_app(); // Remove Analytics Data from Google and other tracking platforms $urldata = parse_url($url); if (is_string($urldata["query"])) { $query = $urldata["query"]; parse_str($query, $querydata); if (is_array($querydata)) foreach ($querydata AS $param=>$value) if (in_array($param, array("utm_source", "utm_medium", "utm_term", "utm_content", "utm_campaign", "wt_mc", "pk_campaign", "pk_kwd", "mc_cid", "mc_eid", "fb_action_ids", "fb_action_types", "fb_ref", "awesm", "wtrid", "woo_campaign", "woo_source", "woo_medium", "woo_content", "woo_term"))) { $pair = $param."=".urlencode($value); $url = str_replace($pair, "", $url); // Second try: if the url isn't encoded completely $pair = $param."=".str_replace(" ", "+", $value); $url = str_replace($pair, "", $url); // Third try: Maybey the url isn't encoded at all $pair = $param."=".$value; $url = str_replace($pair, "", $url); $url = str_replace(array("?&", "&&"), array("?", ""), $url); } if (substr($url, -1, 1) == "?") $url = substr($url, 0, -1); } if ($depth > 10) return($url); $url = trim($url, "'"); $stamp1 = microtime(true); $siteinfo = array(); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_NOBODY, 1); curl_setopt($ch, CURLOPT_TIMEOUT, 10); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, $a->get_useragent()); $header = curl_exec($ch); $curl_info = @curl_getinfo($ch); $http_code = $curl_info['http_code']; curl_close($ch); $a->save_timestamp($stamp1, "network"); if ($http_code == 0) return($url); if ((($curl_info['http_code'] == "301") OR ($curl_info['http_code'] == "302")) AND (($curl_info['redirect_url'] != "") OR ($curl_info['location'] != ""))) { if ($curl_info['redirect_url'] != "") return(original_url($curl_info['redirect_url'], ++$depth, $fetchbody)); else return(original_url($curl_info['location'], ++$depth, $fetchbody)); } // Check for redirects in the meta elements of the body if there are no redirects in the header. if (!$fetchbody) return(original_url($url, ++$depth, true)); // if the file is too large then exit if ($curl_info["download_content_length"] > 1000000) return($url); // if it isn't a HTML file then exit if (($curl_info["content_type"] != "") AND !strstr(strtolower($curl_info["content_type"]),"html")) return($url); $stamp1 = microtime(true); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_NOBODY, 0); curl_setopt($ch, CURLOPT_TIMEOUT, 10); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, $a->get_useragent()); $body = curl_exec($ch); curl_close($ch); $a->save_timestamp($stamp1, "network"); if (trim($body) == "") return($url); // Check for redirect in meta elements $doc = new DOMDocument(); @$doc->loadHTML($body); $xpath = new DomXPath($doc); $list = $xpath->query("//meta[@content]"); foreach ($list as $node) { $attr = array(); if ($node->attributes->length) foreach ($node->attributes as $attribute) $attr[$attribute->name] = $attribute->value; if (@$attr["http-equiv"] == 'refresh') { $path = $attr["content"]; $pathinfo = explode(";", $path); $content = ""; foreach ($pathinfo AS $value) if (substr(strtolower($value), 0, 4) == "url=") return(original_url(substr($value, 4), ++$depth)); } } return($url); } function short_link($url) { require_once('library/slinky.php'); $slinky = new Slinky($url); $yourls_url = get_config('yourls','url1'); if ($yourls_url) { $yourls_username = get_config('yourls','username1'); $yourls_password = get_config('yourls', 'password1'); $yourls_ssl = get_config('yourls', 'ssl1'); $yourls = new Slinky_YourLS(); $yourls->set('username', $yourls_username); $yourls->set('password', $yourls_password); $yourls->set('ssl', $yourls_ssl); $yourls->set('yourls-url', $yourls_url); $slinky->set_cascade( array($yourls, new Slinky_UR1ca(), new Slinky_Trim(), new Slinky_IsGd(), new Slinky_TinyURL())); } else { // setup a cascade of shortening services // try to get a short link from these services // in the order ur1.ca, trim, id.gd, tinyurl $slinky->set_cascade(array(new Slinky_UR1ca(), new Slinky_Trim(), new Slinky_IsGd(), new Slinky_TinyURL())); } return $slinky->short(); } /** * @brief Encodes content to json * * This function encodes an array to json format * and adds an application/json HTTP header to the output. * After finishing the process is getting killed. * * @param array $x The input content */ function json_return_and_die($x) { header("content-type: application/json"); echo json_encode($x); killme(); } /** * @brief Find the matching part between two url * * @param string $url1 * @param string $url2 * @return string The matching part */ function matching_url($url1, $url2) { if (($url1 == "") OR ($url2 == "")) return ""; $url1 = normalise_link($url1); $url2 = normalise_link($url2); $parts1 = parse_url($url1); $parts2 = parse_url($url2); if (!isset($parts1["host"]) OR !isset($parts2["host"])) return ""; if ($parts1["scheme"] != $parts2["scheme"]) return ""; if ($parts1["host"] != $parts2["host"]) return ""; if ($parts1["port"] != $parts2["port"]) return ""; $match = $parts1["scheme"]."://".$parts1["host"]; if ($parts1["port"]) $match .= ":".$parts1["port"]; $pathparts1 = explode("/", $parts1["path"]); $pathparts2 = explode("/", $parts2["path"]); $i = 0; $path = ""; do { $path1 = $pathparts1[$i]; $path2 = $pathparts2[$i]; if ($path1 == $path2) $path .= $path1."/"; } while (($path1 == $path2) AND ($i++ <= count($pathparts1))); $match .= $path; return normalise_link($match); }