Class yii\helpers\FileHelper

                public static function changeOwnership($path, $ownership, $mode = null)
{
    if (!file_exists((string)$path)) {
        throw new InvalidArgumentException('Unable to change ownership, "' . $path . '" is not a file or directory.');
    }
    if (empty($ownership) && $ownership !== 0 && $mode === null) {
        return;
    }
    $user = $group = null;
    if (!empty($ownership) || $ownership === 0 || $ownership === '0') {
        if (is_int($ownership)) {
            $user = $ownership;
        } elseif (is_string($ownership)) {
            $ownerParts = explode(':', $ownership);
            $user = $ownerParts[0];
            if (count($ownerParts) > 1) {
                $group = $ownerParts[1];
            }
        } elseif (is_array($ownership)) {
            $ownershipIsIndexed = ArrayHelper::isIndexed($ownership);
            $user = ArrayHelper::getValue($ownership, $ownershipIsIndexed ? 0 : 'user');
            $group = ArrayHelper::getValue($ownership, $ownershipIsIndexed ? 1 : 'group');
        } else {
            throw new InvalidArgumentException('$ownership must be an integer, string, array, or null.');
        }
    }
    if ($mode !== null) {
        if (!is_int($mode)) {
            throw new InvalidArgumentException('$mode must be an integer or null.');
        }
        if (!chmod($path, $mode)) {
            throw new Exception('Unable to change mode of "' . $path . '" to "0' . decoct($mode) . '".');
        }
    }
    if ($user !== null && $user !== '') {
        if (is_numeric($user)) {
            $user = (int) $user;
        } elseif (!is_string($user)) {
            throw new InvalidArgumentException('The user part of $ownership must be an integer, string, or null.');
        }
        if (!chown($path, $user)) {
            throw new Exception('Unable to change user ownership of "' . $path . '" to "' . $user . '".');
        }
    }
    if ($group !== null && $group !== '') {
        if (is_numeric($group)) {
            $group = (int) $group;
        } elseif (!is_string($group)) {
            throw new InvalidArgumentException('The group part of $ownership must be an integer, string or null.');
        }
        if (!chgrp($path, $group)) {
            throw new Exception('Unable to change group ownership of "' . $path . '" to "' . $group . '".');
        }
    }
}

            

                public static function copyDirectory($src, $dst, $options = [])
{
    $src = static::normalizePath($src);
    $dst = static::normalizePath($dst);
    if ($src === $dst || strpos($dst, $src . DIRECTORY_SEPARATOR) === 0) {
        throw new InvalidArgumentException('Trying to copy a directory to itself or a subdirectory.');
    }
    $dstExists = is_dir($dst);
    if (!$dstExists && (!isset($options['copyEmptyDirectories']) || $options['copyEmptyDirectories'])) {
        static::createDirectory($dst, isset($options['dirMode']) ? $options['dirMode'] : 0775, true);
        $dstExists = true;
    }
    $handle = opendir($src);
    if ($handle === false) {
        throw new InvalidArgumentException("Unable to open directory: $src");
    }
    if (!isset($options['basePath'])) {
        // this should be done only once
        $options['basePath'] = realpath($src);
        $options = static::normalizeOptions($options);
    }
    while (($file = readdir($handle)) !== false) {
        if ($file === '.' || $file === '..') {
            continue;
        }
        $from = $src . DIRECTORY_SEPARATOR . $file;
        $to = $dst . DIRECTORY_SEPARATOR . $file;
        if (static::filterPath($from, $options)) {
            if (isset($options['beforeCopy']) && !call_user_func($options['beforeCopy'], $from, $to)) {
                continue;
            }
            if (is_file($from)) {
                if (!$dstExists) {
                    // delay creation of destination directory until the first file is copied to avoid creating empty directories
                    static::createDirectory($dst, isset($options['dirMode']) ? $options['dirMode'] : 0775, true);
                    $dstExists = true;
                }
                copy($from, $to);
                if (isset($options['fileMode'])) {
                    @chmod($to, $options['fileMode']);
                }
            } else {
                // recursive copy, defaults to true
                if (!isset($options['recursive']) || $options['recursive']) {
                    static::copyDirectory($from, $to, $options);
                }
            }
            if (isset($options['afterCopy'])) {
                call_user_func($options['afterCopy'], $from, $to);
            }
        }
    }
    closedir($handle);
}

            

                public static function createDirectory($path, $mode = 0775, $recursive = true)
{
    if (is_dir($path)) {
        return true;
    }
    $parentDir = dirname($path);
    // recurse if parent dir does not exist and we are not at the root of the file system.
    if ($recursive && !is_dir($parentDir) && $parentDir !== $path) {
        static::createDirectory($parentDir, $mode, true);
    }
    try {
        if (!mkdir($path, $mode)) {
            return false;
        }
    } catch (\Exception $e) {
        if (!is_dir($path)) {// https://github.com/yiisoft/yii2/issues/9288
            throw new \yii\base\Exception("Failed to create directory \"$path\": " . $e->getMessage(), $e->getCode(), $e);
        }
    }
    try {
        return chmod($path, $mode);
    } catch (\Exception $e) {
        throw new \yii\base\Exception("Failed to change permissions for directory \"$path\": " . $e->getMessage(), $e->getCode(), $e);
    }
}

            

                public static function filterPath($path, $options)
{
    if (isset($options['filter'])) {
        $result = call_user_func($options['filter'], $path);
        if (is_bool($result)) {
            return $result;
        }
    }
    if (empty($options['except']) && empty($options['only'])) {
        return true;
    }
    $path = str_replace('\\', '/', $path);
    if (
        !empty($options['except'])
        && ($except = self::lastExcludeMatchingFromList($options['basePath'], $path, $options['except'])) !== null
    ) {
        return $except['flags'] & self::PATTERN_NEGATIVE;
    }
    if (!empty($options['only']) && !is_dir($path)) {
        return self::lastExcludeMatchingFromList($options['basePath'], $path, $options['only']) !== null;
    }
    return true;
}

            

                public static function findDirectories($dir, $options = [])
{
    $dir = self::clearDir($dir);
    $options = self::setBasePath($dir, $options);
    $list = [];
    $handle = self::openDir($dir);
    while (($file = readdir($handle)) !== false) {
        if ($file === '.' || $file === '..') {
            continue;
        }
        $path = $dir . DIRECTORY_SEPARATOR . $file;
        if (is_dir($path) && static::filterPath($path, $options)) {
            $list[] = $path;
            if (!isset($options['recursive']) || $options['recursive']) {
                $list = array_merge($list, static::findDirectories($path, $options));
            }
        }
    }
    closedir($handle);
    return $list;
}

            

                public static function findFiles($dir, $options = [])
{
    $dir = self::clearDir($dir);
    $options = self::setBasePath($dir, $options);
    $list = [];
    $handle = self::openDir($dir);
    while (($file = readdir($handle)) !== false) {
        if ($file === '.' || $file === '..') {
            continue;
        }
        $path = $dir . DIRECTORY_SEPARATOR . $file;
        if (static::filterPath($path, $options)) {
            if (is_file($path)) {
                $list[] = $path;
            } elseif (is_dir($path) && (!isset($options['recursive']) || $options['recursive'])) {
                $list = array_merge($list, static::findFiles($path, $options));
            }
        }
    }
    closedir($handle);
    return $list;
}

            

                public static function getExtensionByMimeType($mimeType, $preferShort = false, $magicFile = null)
{
    $aliases = static::loadMimeAliases(static::$mimeAliasesFile);
    if (isset($aliases[$mimeType])) {
        $mimeType = $aliases[$mimeType];
    }
    $mimeExtensions = static::loadMimeExtensions($magicFile);
    if (!array_key_exists($mimeType, $mimeExtensions)) {
        return null;
    }
    $extensions = $mimeExtensions[$mimeType];
    if (is_array($extensions)) {
        if ($preferShort) {
            foreach ($extensions as $extension) {
                if (mb_strlen($extension, 'UTF-8') <= 3) {
                    return $extension;
                }
            }
        }
        return $extensions[0];
    } else {
        return $extensions;
    }
}

            

                public static function getExtensionsByMimeType($mimeType, $magicFile = null)
{
    $aliases = static::loadMimeAliases(static::$mimeAliasesFile);
    if (isset($aliases[$mimeType])) {
        $mimeType = $aliases[$mimeType];
    }
    // Note: For backwards compatibility the "MimeTypes" file is used.
    $mimeTypes = static::loadMimeTypes($magicFile);
    return array_keys($mimeTypes, mb_strtolower($mimeType, 'UTF-8'), true);
}

            

                public static function getMimeType($file, $magicFile = null, $checkExtension = true)
{
    if ($magicFile !== null) {
        $magicFile = Yii::getAlias($magicFile);
    }
    if (!extension_loaded('fileinfo')) {
        if ($checkExtension) {
            return static::getMimeTypeByExtension($file, $magicFile);
        }
        throw new InvalidConfigException('The fileinfo PHP extension is not installed.');
    }
    $info = finfo_open(FILEINFO_MIME_TYPE, $magicFile);
    if ($info) {
        $result = finfo_file($info, $file);
        finfo_close($info);
        if ($result !== false) {
            return $result;
        }
    }
    return $checkExtension ? static::getMimeTypeByExtension($file, $magicFile) : null;
}

            

                public static function getMimeTypeByExtension($file, $magicFile = null)
{
    $mimeTypes = static::loadMimeTypes($magicFile);
    if (($ext = pathinfo($file, PATHINFO_EXTENSION)) !== '') {
        $ext = strtolower($ext);
        if (isset($mimeTypes[$ext])) {
            return $mimeTypes[$ext];
        }
    }
    return null;
}

            

                protected static function loadMimeAliases($aliasesFile)
{
    if ($aliasesFile === null) {
        $aliasesFile = static::$mimeAliasesFile;
    }
    $aliasesFile = Yii::getAlias($aliasesFile);
    if (!isset(self::$_mimeAliases[$aliasesFile])) {
        self::$_mimeAliases[$aliasesFile] = require $aliasesFile;
    }
    return self::$_mimeAliases[$aliasesFile];
}

            

                protected static function loadMimeExtensions($extensionsFile)
{
    if ($extensionsFile === null) {
        $extensionsFile = static::$mimeExtensionsFile;
    }
    $extensionsFile = Yii::getAlias($extensionsFile);
    if (!isset(self::$_mimeExtensions[$extensionsFile])) {
        self::$_mimeExtensions[$extensionsFile] = require $extensionsFile;
    }
    return self::$_mimeExtensions[$extensionsFile];
}

            

                protected static function loadMimeTypes($magicFile)
{
    if ($magicFile === null) {
        $magicFile = static::$mimeMagicFile;
    }
    $magicFile = Yii::getAlias($magicFile);
    if (!isset(self::$_mimeTypes[$magicFile])) {
        self::$_mimeTypes[$magicFile] = require $magicFile;
    }
    return self::$_mimeTypes[$magicFile];
}

            

                public static function localize($file, $language = null, $sourceLanguage = null)
{
    if ($language === null) {
        $language = Yii::$app->language;
    }
    if ($sourceLanguage === null) {
        $sourceLanguage = Yii::$app->sourceLanguage;
    }
    if ($language === $sourceLanguage) {
        return $file;
    }
    $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
    if (is_file($desiredFile)) {
        return $desiredFile;
    }
    $language = substr($language, 0, 2);
    if ($language === $sourceLanguage) {
        return $file;
    }
    $desiredFile = dirname($file) . DIRECTORY_SEPARATOR . $language . DIRECTORY_SEPARATOR . basename($file);
    return is_file($desiredFile) ? $desiredFile : $file;
}

            

                protected static function normalizeOptions(array $options)
{
    if (!array_key_exists('caseSensitive', $options)) {
        $options['caseSensitive'] = true;
    }
    if (isset($options['except'])) {
        foreach ($options['except'] as $key => $value) {
            if (is_string($value)) {
                $options['except'][$key] = self::parseExcludePattern($value, $options['caseSensitive']);
            }
        }
    }
    if (isset($options['only'])) {
        foreach ($options['only'] as $key => $value) {
            if (is_string($value)) {
                $options['only'][$key] = self::parseExcludePattern($value, $options['caseSensitive']);
            }
        }
    }
    return $options;
}

            

                public static function normalizePath($path, $ds = DIRECTORY_SEPARATOR)
{
    $path = rtrim(strtr($path, '/\\', $ds . $ds), $ds);
    if (strpos($ds . $path, "{$ds}.") === false && strpos($path, "{$ds}{$ds}") === false) {
        return $path;
    }
    // fix #17235 stream wrappers
    foreach (stream_get_wrappers() as $protocol) {
        if (strpos($path, "{$protocol}://") === 0) {
            return $path;
        }
    }
    // the path may contain ".", ".." or double slashes, need to clean them up
    if (strpos($path, "{$ds}{$ds}") === 0 && $ds == '\\') {
        $parts = [$ds];
    } else {
        $parts = [];
    }
    foreach (explode($ds, $path) as $part) {
        if ($part === '..' && !empty($parts) && end($parts) !== '..') {
            array_pop($parts);
        } elseif ($part === '.' || $part === '' && !empty($parts)) {
            continue;
        } else {
            $parts[] = $part;
        }
    }
    $path = implode($ds, $parts);
    return $path === '' ? '.' : $path;
}

            

                public static function removeDirectory($dir, $options = [])
{
    if (!is_dir($dir)) {
        return;
    }
    if (!empty($options['traverseSymlinks']) || !is_link($dir)) {
        if (!($handle = opendir($dir))) {
            return;
        }
        while (($file = readdir($handle)) !== false) {
            if ($file === '.' || $file === '..') {
                continue;
            }
            $path = $dir . DIRECTORY_SEPARATOR . $file;
            if (is_dir($path)) {
                static::removeDirectory($path, $options);
            } else {
                static::unlink($path);
            }
        }
        closedir($handle);
    }
    if (is_link($dir)) {
        static::unlink($dir);
    } else {
        rmdir($dir);
    }
}

            

                public static function unlink($path)
{
    $isWindows = DIRECTORY_SEPARATOR === '\\';
    if (!$isWindows) {
        return unlink($path);
    }
    if (is_link($path) && is_dir($path)) {
        return rmdir($path);
    }
    try {
        return unlink($path);
    } catch (ErrorException $e) {
        // last resort measure for Windows
        if (is_dir($path) && count(static::findFiles($path)) !== 0) {
            return false;
        }
        if (function_exists('exec') && file_exists($path)) {
            exec('DEL /F/Q ' . escapeshellarg($path));
            return !file_exists($path);
        }
        return false;
    }
}