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<?php
/**
* @file boot.php
* This file defines some global constants and includes the central App class.
*/
/**
* Friendica
*
* Friendica is a communications platform for integrated social communications
* utilising decentralised communications and linkage to several indie social
* projects - as well as popular mainstream providers.
*
* Our mission is to free our friends and families from the clutches of
* data-harvesting corporations, and pave the way to a future where social
* communications are free and open and flow between alternate providers as
* easily as email does today.
*/
use Friendica\App;
use Friendica\BaseObject;
use Friendica\Core\Config;
use Friendica\Core\PConfig;
use Friendica\Core\Protocol;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Util\BasePath;
use Friendica\Util\DateTimeFormat;
define('FRIENDICA_PLATFORM', 'Friendica');
define('FRIENDICA_CODENAME', 'The Tazmans Flax-lily');
define('FRIENDICA_VERSION', '2019.03-dev');
define('DFRN_PROTOCOL_VERSION', '2.23');
define('NEW_UPDATE_ROUTINE_VERSION', 1170);
/**
* @brief Constant with a HTML line break.
*
* Contains a HTML line break (br) element and a real carriage return with line
* feed for the source.
* This can be used in HTML and JavaScript where needed a line break.
*/
define('EOL', "<br />\r\n");
/**
* @brief Image storage quality.
*
* Lower numbers save space at cost of image detail.
* For ease of upgrade, please do not change here. Set system.jpegquality = n in config/local.config.php,
* where n is between 1 and 100, and with very poor results below about 50
*/
define('JPEG_QUALITY', 100);
/**
* system.png_quality = n where is between 0 (uncompressed) to 9
*/
define('PNG_QUALITY', 8);
/**
* An alternate way of limiting picture upload sizes. Specify the maximum pixel
* length that pictures are allowed to be (for non-square pictures, it will apply
* to the longest side). Pictures longer than this length will be resized to be
* this length (on the longest side, the other side will be scaled appropriately).
* Modify this value using
*
* 'system' => [
* 'max_image_length' => 'n',
* ...
* ],
*
* in config/local.config.php
*
* If you don't want to set a maximum length, set to -1. The default value is
* defined by 'MAX_IMAGE_LENGTH' below.
*/
define('MAX_IMAGE_LENGTH', -1);
/**
* Not yet used
*/
define('DEFAULT_DB_ENGINE', 'InnoDB');
/**
* @name SSL Policy
*
* SSL redirection policies
* @{
*/
define('SSL_POLICY_NONE', 0);
define('SSL_POLICY_FULL', 1);
define('SSL_POLICY_SELFSIGN', 2);
/* @}*/
/**
* @name CP
*
* Type of the community page
* @{
*/
define('CP_NO_INTERNAL_COMMUNITY', -2);
define('CP_NO_COMMUNITY_PAGE', -1);
define('CP_USERS_ON_SERVER', 0);
define('CP_GLOBAL_COMMUNITY', 1);
define('CP_USERS_AND_GLOBAL', 2);
/**
* @}
*/
/**
* These numbers are used in stored permissions
* and existing allocations MUST NEVER BE CHANGED
* OR RE-ASSIGNED! You may only add to them.
*/
$netgroup_ids = [
Protocol::DFRN => (-1),
Protocol::ZOT => (-2),
Protocol::OSTATUS => (-3),
Protocol::FEED => (-4),
Protocol::DIASPORA => (-5),
Protocol::MAIL => (-6),
Protocol::FACEBOOK => (-8),
Protocol::LINKEDIN => (-9),
Protocol::XMPP => (-10),
Protocol::MYSPACE => (-11),
Protocol::GPLUS => (-12),
Protocol::PUMPIO => (-13),
Protocol::TWITTER => (-14),
Protocol::DIASPORA2 => (-15),
Protocol::STATUSNET => (-16),
Protocol::NEWS => (-18),
Protocol::ICALENDAR => (-19),
Protocol::PNUT => (-20),
Protocol::PHANTOM => (-127),
];
/**
* Maximum number of "people who like (or don't like) this" that we will list by name
*/
define('MAX_LIKERS', 75);
/**
* @name Notify
*
* Email notification options
* @{
*/
define('NOTIFY_INTRO', 1);
define('NOTIFY_CONFIRM', 2);
define('NOTIFY_WALL', 4);
define('NOTIFY_COMMENT', 8);
define('NOTIFY_MAIL', 16);
define('NOTIFY_SUGGEST', 32);
define('NOTIFY_PROFILE', 64);
define('NOTIFY_TAGSELF', 128);
define('NOTIFY_TAGSHARE', 256);
define('NOTIFY_POKE', 512);
define('NOTIFY_SHARE', 1024);
define('SYSTEM_EMAIL', 16384);
define('NOTIFY_SYSTEM', 32768);
/* @}*/
/**
* @name Term
*
* Tag/term types
* @{
*/
define('TERM_UNKNOWN', 0);
define('TERM_HASHTAG', 1);
define('TERM_MENTION', 2);
define('TERM_CATEGORY', 3);
define('TERM_PCATEGORY', 4);
define('TERM_FILE', 5);
define('TERM_SAVEDSEARCH', 6);
define('TERM_CONVERSATION', 7);
define('TERM_OBJ_POST', 1);
define('TERM_OBJ_PHOTO', 2);
/**
* @name Namespaces
*
* Various namespaces we may need to parse
* @{
*/
define('NAMESPACE_ZOT', 'http://purl.org/zot');
define('NAMESPACE_DFRN', 'http://purl.org/macgirvin/dfrn/1.0');
define('NAMESPACE_THREAD', 'http://purl.org/syndication/thread/1.0');
define('NAMESPACE_TOMB', 'http://purl.org/atompub/tombstones/1.0');
define('NAMESPACE_ACTIVITY', 'http://activitystrea.ms/spec/1.0/');
define('NAMESPACE_ACTIVITY_SCHEMA', 'http://activitystrea.ms/schema/1.0/');
define('NAMESPACE_MEDIA', 'http://purl.org/syndication/atommedia');
define('NAMESPACE_SALMON_ME', 'http://salmon-protocol.org/ns/magic-env');
define('NAMESPACE_OSTATUSSUB', 'http://ostatus.org/schema/1.0/subscribe');
define('NAMESPACE_GEORSS', 'http://www.georss.org/georss');
define('NAMESPACE_POCO', 'http://portablecontacts.net/spec/1.0');
define('NAMESPACE_FEED', 'http://schemas.google.com/g/2010#updates-from');
define('NAMESPACE_OSTATUS', 'http://ostatus.org/schema/1.0');
define('NAMESPACE_STATUSNET', 'http://status.net/schema/api/1/');
define('NAMESPACE_ATOM1', 'http://www.w3.org/2005/Atom');
define('NAMESPACE_MASTODON', 'http://mastodon.social/schema/1.0');
/* @}*/
/**
* @name Activity
*
* Activity stream defines
* @{
*/
define('ACTIVITY_LIKE', NAMESPACE_ACTIVITY_SCHEMA . 'like');
define('ACTIVITY_DISLIKE', NAMESPACE_DFRN . '/dislike');
define('ACTIVITY_ATTEND', NAMESPACE_ZOT . '/activity/attendyes');
define('ACTIVITY_ATTENDNO', NAMESPACE_ZOT . '/activity/attendno');
define('ACTIVITY_ATTENDMAYBE', NAMESPACE_ZOT . '/activity/attendmaybe');
define('ACTIVITY_OBJ_HEART', NAMESPACE_DFRN . '/heart');
define('ACTIVITY_FRIEND', NAMESPACE_ACTIVITY_SCHEMA . 'make-friend');
define('ACTIVITY_REQ_FRIEND', NAMESPACE_ACTIVITY_SCHEMA . 'request-friend');
define('ACTIVITY_UNFRIEND', NAMESPACE_ACTIVITY_SCHEMA . 'remove-friend');
define('ACTIVITY_FOLLOW', NAMESPACE_ACTIVITY_SCHEMA . 'follow');
define('ACTIVITY_UNFOLLOW', NAMESPACE_ACTIVITY_SCHEMA . 'stop-following');
define('ACTIVITY_JOIN', NAMESPACE_ACTIVITY_SCHEMA . 'join');
define('ACTIVITY_POST', NAMESPACE_ACTIVITY_SCHEMA . 'post');
define('ACTIVITY_UPDATE', NAMESPACE_ACTIVITY_SCHEMA . 'update');
define('ACTIVITY_TAG', NAMESPACE_ACTIVITY_SCHEMA . 'tag');
define('ACTIVITY_FAVORITE', NAMESPACE_ACTIVITY_SCHEMA . 'favorite');
define('ACTIVITY_UNFAVORITE', NAMESPACE_ACTIVITY_SCHEMA . 'unfavorite');
define('ACTIVITY_SHARE', NAMESPACE_ACTIVITY_SCHEMA . 'share');
define('ACTIVITY_DELETE', NAMESPACE_ACTIVITY_SCHEMA . 'delete');
define('ACTIVITY_POKE', NAMESPACE_ZOT . '/activity/poke');
define('ACTIVITY_OBJ_BOOKMARK', NAMESPACE_ACTIVITY_SCHEMA . 'bookmark');
define('ACTIVITY_OBJ_COMMENT', NAMESPACE_ACTIVITY_SCHEMA . 'comment');
define('ACTIVITY_OBJ_NOTE', NAMESPACE_ACTIVITY_SCHEMA . 'note');
define('ACTIVITY_OBJ_PERSON', NAMESPACE_ACTIVITY_SCHEMA . 'person');
define('ACTIVITY_OBJ_IMAGE', NAMESPACE_ACTIVITY_SCHEMA . 'image');
define('ACTIVITY_OBJ_PHOTO', NAMESPACE_ACTIVITY_SCHEMA . 'photo');
define('ACTIVITY_OBJ_VIDEO', NAMESPACE_ACTIVITY_SCHEMA . 'video');
define('ACTIVITY_OBJ_P_PHOTO', NAMESPACE_ACTIVITY_SCHEMA . 'profile-photo');
define('ACTIVITY_OBJ_ALBUM', NAMESPACE_ACTIVITY_SCHEMA . 'photo-album');
define('ACTIVITY_OBJ_EVENT', NAMESPACE_ACTIVITY_SCHEMA . 'event');
define('ACTIVITY_OBJ_GROUP', NAMESPACE_ACTIVITY_SCHEMA . 'group');
define('ACTIVITY_OBJ_TAGTERM', NAMESPACE_DFRN . '/tagterm');
define('ACTIVITY_OBJ_PROFILE', NAMESPACE_DFRN . '/profile');
define('ACTIVITY_OBJ_QUESTION', 'http://activityschema.org/object/question');
/* @}*/
/**
* @name Gravity
*
* Item weight for query ordering
* @{
*/
define('GRAVITY_PARENT', 0);
define('GRAVITY_ACTIVITY', 3);
define('GRAVITY_COMMENT', 6);
define('GRAVITY_UNKNOWN', 9);
/* @}*/
/**
* @name Priority
*
* Process priority for the worker
* @{
*/
define('PRIORITY_UNDEFINED', 0);
define('PRIORITY_CRITICAL', 10);
define('PRIORITY_HIGH', 20);
define('PRIORITY_MEDIUM', 30);
define('PRIORITY_LOW', 40);
define('PRIORITY_NEGLIGIBLE', 50);
/* @}*/
/**
* @name Social Relay settings
*
* See here: https://github.com/jaywink/social-relay
* and here: https://wiki.diasporafoundation.org/Relay_servers_for_public_posts
* @{
*/
define('SR_SCOPE_NONE', '');
define('SR_SCOPE_ALL', 'all');
define('SR_SCOPE_TAGS', 'tags');
/* @}*/
// Normally this constant is defined - but not if "pcntl" isn't installed
if (!defined("SIGTERM")) {
define("SIGTERM", 15);
}
/**
* Depending on the PHP version this constant does exist - or not.
* See here: http://php.net/manual/en/curl.constants.php#117928
*/
if (!defined('CURLE_OPERATION_TIMEDOUT')) {
define('CURLE_OPERATION_TIMEDOUT', CURLE_OPERATION_TIMEOUTED);
}
/**
* @brief Retrieve the App structure
*
* Useful in functions which require it but don't get it passed to them
*
* @deprecated since version 2018.09
* @see BaseObject::getApp()
* @return App
*/
function get_app()
{
return BaseObject::getApp();
}
/**
* Return the provided variable value if it exists and is truthy or the provided
* default value instead.
*
* Works with initialized variables and potentially uninitialized array keys
*
* Usages:
* - defaults($var, $default)
* - defaults($array, 'key', $default)
*
* @param array $args
* @brief Returns a defaut value if the provided variable or array key is falsy
* @return mixed
*/
function defaults(...$args)
{
if (count($args) < 2) {
throw new BadFunctionCallException('defaults() requires at least 2 parameters');
}
if (count($args) > 3) {
throw new BadFunctionCallException('defaults() cannot use more than 3 parameters');
}
if (count($args) === 3 && is_null($args[1])) {
throw new BadFunctionCallException('defaults($arr, $key, $def) $key is null');
}
// The default value always is the last argument
$return = array_pop($args);
if (count($args) == 2 && is_array($args[0]) && !empty($args[0][$args[1]])) {
$return = $args[0][$args[1]];
}
if (count($args) == 1 && !empty($args[0])) {
$return = $args[0];
}
return $return;
}
/**
* @brief Used to end the current process, after saving session state.
* @deprecated
*/
function killme()
{
exit();
}
/**
* @brief Returns the user id of locally logged in user or false.
*
* @return int|bool user id or false
*/
function local_user()
{
if (!empty($_SESSION['authenticated']) && !empty($_SESSION['uid'])) {
return intval($_SESSION['uid']);
}
return false;
}
/**
* @brief Returns the public contact id of logged in user or false.
*
* @return int|bool public contact id or false
*/
function public_contact()
{
static $public_contact_id = false;
if (!$public_contact_id && !empty($_SESSION['authenticated'])) {
if (!empty($_SESSION['my_address'])) {
// Local user
$public_contact_id = intval(Contact::getIdForURL($_SESSION['my_address'], 0, true));
} elseif (!empty($_SESSION['visitor_home'])) {
// Remote user
$public_contact_id = intval(Contact::getIdForURL($_SESSION['visitor_home'], 0, true));
}
} elseif (empty($_SESSION['authenticated'])) {
$public_contact_id = false;
}
return $public_contact_id;
}
/**
* @brief Returns contact id of authenticated site visitor or false
*
* @return int|bool visitor_id or false
*/
function remote_user()
{
// You cannot be both local and remote.
// Unncommented by rabuzarus because remote authentication to local
// profiles wasn't possible anymore (2018-04-12).
// if (local_user()) {
// return false;
// }
if (empty($_SESSION)) {
return false;
}
if (!empty($_SESSION['authenticated']) && !empty($_SESSION['visitor_id'])) {
return intval($_SESSION['visitor_id']);
}
return false;
}
/**
* @brief Show an error message to user.
*
* This function save text in session, to be shown to the user at next page load
*
* @param string $s - Text of notice
*/
function notice($s)
{
if (empty($_SESSION)) {
return;
}
$a = \get_app();
if (empty($_SESSION['sysmsg'])) {
$_SESSION['sysmsg'] = [];
}
if ($a->interactive) {
$_SESSION['sysmsg'][] = $s;
}
}
/**
* @brief Show an info message to user.
*
* This function save text in session, to be shown to the user at next page load
*
* @param string $s - Text of notice
*/
function info($s)
{
$a = \get_app();
if (local_user() && PConfig::get(local_user(), 'system', 'ignore_info')) {
return;
}
if (empty($_SESSION['sysmsg_info'])) {
$_SESSION['sysmsg_info'] = [];
}
if ($a->interactive) {
$_SESSION['sysmsg_info'][] = $s;
}
}
function feed_birthday($uid, $tz)
{
/**
* Determine the next birthday, but only if the birthday is published
* in the default profile. We _could_ also look for a private profile that the
* recipient can see, but somebody could get mad at us if they start getting
* public birthday greetings when they haven't made this info public.
*
* Assuming we are able to publish this info, we are then going to convert
* the start time from the owner's timezone to UTC.
*
* This will potentially solve the problem found with some social networks
* where birthdays are converted to the viewer's timezone and salutations from
* elsewhere in the world show up on the wrong day. We will convert it to the
* viewer's timezone also, but first we are going to convert it from the birthday
* person's timezone to GMT - so the viewer may find the birthday starting at
* 6:00PM the day before, but that will correspond to midnight to the birthday person.
*/
$birthday = '';
if (!strlen($tz)) {
$tz = 'UTC';
}
$profile = DBA::selectFirst('profile', ['dob'], ['is-default' => true, 'uid' => $uid]);
if (DBA::isResult($profile)) {
$tmp_dob = substr($profile['dob'], 5);
if (intval($tmp_dob)) {
$y = DateTimeFormat::timezoneNow($tz, 'Y');
$bd = $y . '-' . $tmp_dob . ' 00:00';
$t_dob = strtotime($bd);
$now = strtotime(DateTimeFormat::timezoneNow($tz));
if ($t_dob < $now) {
$bd = $y + 1 . '-' . $tmp_dob . ' 00:00';
}
$birthday = DateTimeFormat::convert($bd, 'UTC', $tz, DateTimeFormat::ATOM);
}
}
return $birthday;
}
/**
* @brief Check if current user has admin role.
*
* @return bool true if user is an admin
*/
function is_site_admin()
{
$a = \get_app();
$admin_email = Config::get('config', 'admin_email');
$adminlist = explode(',', str_replace(' ', '', $admin_email));
return local_user() && $admin_email && in_array(defaults($a->user, 'email', ''), $adminlist);
}
/**
* @brief Returns querystring as string from a mapped array.
*
* @param array $params mapped array with query parameters
* @param string $name of parameter, default null
*
* @return string
*/
function build_querystring($params, $name = null)
{
$ret = "";
foreach ($params as $key => $val) {
if (is_array($val)) {
/// @TODO maybe not compare against null, use is_null()
if ($name == null) {
$ret .= build_querystring($val, $key);
} else {
$ret .= build_querystring($val, $name . "[$key]");
}
} else {
$val = urlencode($val);
/// @TODO maybe not compare against null, use is_null()
if ($name != null) {
/// @TODO two string concated, can be merged to one
$ret .= $name . "[$key]" . "=$val&";
} else {
$ret .= "$key=$val&";
}
}
}
return $ret;
}
function explode_querystring($query)
{
$arg_st = strpos($query, '?');
if ($arg_st !== false) {
$base = substr($query, 0, $arg_st);
$arg_st += 1;
} else {
$base = '';
$arg_st = 0;
}
$args = explode('&', substr($query, $arg_st));
foreach ($args as $k => $arg) {
/// @TODO really compare type-safe here?
if ($arg === '') {
unset($args[$k]);
}
}
$args = array_values($args);
if (!$base) {
$base = $args[0];
unset($args[0]);
$args = array_values($args);
}
return [
'base' => $base,
'args' => $args,
];
}
/**
* Returns the complete URL of the current page, e.g.: http(s)://something.com/network
*
* Taken from http://webcheatsheet.com/php/get_current_page_url.php
*/
function curPageURL()
{
$pageURL = 'http';
if (!empty($_SERVER["HTTPS"]) && ($_SERVER["HTTPS"] == "on")) {
$pageURL .= "s";
}
$pageURL .= "://";
if ($_SERVER["SERVER_PORT"] != "80" && $_SERVER["SERVER_PORT"] != "443") {
$pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
} else {
$pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
}
return $pageURL;
}
function get_server()
{
$server = Config::get("system", "directory");
if ($server == "") {
$server = "https://dir.friendica.social";
}
return $server;
}
function get_temppath()
{
$a = \get_app();
$temppath = Config::get("system", "temppath");
if (($temppath != "") && System::isDirectoryUsable($temppath)) {
// We have a temp path and it is usable
return BasePath::getRealPath($temppath);
}
// We don't have a working preconfigured temp path, so we take the system path.
$temppath = sys_get_temp_dir();
// Check if it is usable
if (($temppath != "") && System::isDirectoryUsable($temppath)) {
// Always store the real path, not the path through symlinks
$temppath = BasePath::getRealPath($temppath);
// To avoid any interferences with other systems we create our own directory
$new_temppath = $temppath . "/" . $a->getHostName();
if (!is_dir($new_temppath)) {
/// @TODO There is a mkdir()+chmod() upwards, maybe generalize this (+ configurable) into a function/method?
mkdir($new_temppath);
}
if (System::isDirectoryUsable($new_temppath)) {
// The new path is usable, we are happy
Config::set("system", "temppath", $new_temppath);
return $new_temppath;
} else {
// We can't create a subdirectory, strange.
// But the directory seems to work, so we use it but don't store it.
return $temppath;
}
}
// Reaching this point means that the operating system is configured badly.
return '';
}
function get_cachefile($file, $writemode = true)
{
$cache = get_itemcachepath();
if ((!$cache) || (!is_dir($cache))) {
return "";
}
$subfolder = $cache . "/" . substr($file, 0, 2);
$cachepath = $subfolder . "/" . $file;
if ($writemode) {
if (!is_dir($subfolder)) {
mkdir($subfolder);
chmod($subfolder, 0777);
}
}
return $cachepath;
}
function clear_cache($basepath = "", $path = "")
{
if ($path == "") {
$basepath = get_itemcachepath();
$path = $basepath;
}
if (($path == "") || (!is_dir($path))) {
return;
}
if (substr(realpath($path), 0, strlen($basepath)) != $basepath) {
return;
}
$cachetime = (int) Config::get('system', 'itemcache_duration');
if ($cachetime == 0) {
$cachetime = 86400;
}
if (is_writable($path)) {
if ($dh = opendir($path)) {
while (($file = readdir($dh)) !== false) {
$fullpath = $path . "/" . $file;
if ((filetype($fullpath) == "dir") && ($file != ".") && ($file != "..")) {
clear_cache($basepath, $fullpath);
}
if ((filetype($fullpath) == "file") && (filectime($fullpath) < (time() - $cachetime))) {
unlink($fullpath);
}
}
closedir($dh);
}
}
}
function get_itemcachepath()
{
// Checking, if the cache is deactivated
$cachetime = (int) Config::get('system', 'itemcache_duration');
if ($cachetime < 0) {
return "";
}
$itemcache = Config::get('system', 'itemcache');
if (($itemcache != "") && System::isDirectoryUsable($itemcache)) {
return BasePath::getRealPath($itemcache);
}
$temppath = get_temppath();
if ($temppath != "") {
$itemcache = $temppath . "/itemcache";
if (!file_exists($itemcache) && !is_dir($itemcache)) {
mkdir($itemcache);
}
if (System::isDirectoryUsable($itemcache)) {
Config::set("system", "itemcache", $itemcache);
return $itemcache;
}
}
return "";
}
/**
* @brief Returns the path where spool files are stored
*
* @return string Spool path
*/
function get_spoolpath()
{
$spoolpath = Config::get('system', 'spoolpath');
if (($spoolpath != "") && System::isDirectoryUsable($spoolpath)) {
// We have a spool path and it is usable
return $spoolpath;
}
// We don't have a working preconfigured spool path, so we take the temp path.
$temppath = get_temppath();
if ($temppath != "") {
// To avoid any interferences with other systems we create our own directory
$spoolpath = $temppath . "/spool";
if (!is_dir($spoolpath)) {
mkdir($spoolpath);
}
if (System::isDirectoryUsable($spoolpath)) {
// The new path is usable, we are happy
Config::set("system", "spoolpath", $spoolpath);
return $spoolpath;
} else {
// We can't create a subdirectory, strange.
// But the directory seems to work, so we use it but don't store it.
return $temppath;
}
}
// Reaching this point means that the operating system is configured badly.
return "";
}
if (!function_exists('exif_imagetype')) {
function exif_imagetype($file)
{
$size = getimagesize($file);
return $size[2];
}
}
function validate_include(&$file)
{
$orig_file = $file;
$file = realpath($file);
if (strpos($file, getcwd()) !== 0) {
return false;
}
$file = str_replace(getcwd() . "/", "", $file, $count);
if ($count != 1) {
return false;
}
if ($orig_file !== $file) {
return false;
}
$valid = false;
if (strpos($file, "include/") === 0) {
$valid = true;
}
if (strpos($file, "addon/") === 0) {
$valid = true;
}
// Simply return flag
return $valid;
}
/**
* PHP 5 compatible dirname() with count parameter
*
* @see http://php.net/manual/en/function.dirname.php#113193
*
* @deprecated with PHP 7
* @param string $path
* @param int $levels
* @return string
*/
function rdirname($path, $levels = 1)
{
if ($levels > 1) {
return dirname(rdirname($path, --$levels));
} else {
return dirname($path);
}
}
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